Current Electricity

The heat produced by a current I in the wire of resistance R during time interval t is:

Which of the following has the highest resistivity?

A wire has resistance 100 ohm at 0 and 200 Ohm at 100. What is its temperature coefficient in K^-1?

100 joules work has been done by an agency in 10 seconds. What is the power of agency?

A 5 ohm resistor is indicated by a single _______ colour band around its body.

The algebraic sum of potential changes in a circuit is zero is Kirchhoff's ______ rule.

The deviation of I-V graph from the straight line is due to:

The substances like germanium and silicon have:

If ‘V’ is applied potential difference across a resistance ‘R’, then loss in potential energy per unit time is:

The equivalent current which passes from a point at higher potential to a point at a lower potential as if it represented a movement of positive charges is:

The consumption of energy by 60-watt bulb in 2 seconds is:

Total resistance between ‘A’ and ‘B’ in the given circuit is:

The resistance between two opposite faces of a square thin film of area 1 mm² having a thickness of 1 m if the resistivity of the material is 10^-6 Ωm will be:

The effective resistance between the points A and B in the figure is

A carbon resistor connected to a battery of 50V and 2A current is passing through it. If voltage is increased to 75V then current will be:

When the current is neither drawn from a source nor given to it then:

A wire of resistance 4Ω is bent in the form of a circle. The resistance between the ends of any diameter is:

When a potential difference is applied across the ends of a uniform wire of length l and radius r, a current I flows in the wire. If same potential difference is applied to the ends of another wire of the same material but of length 2l and radius 2r, the current in the wire is:

A low voltage supply with an e.m.f. of 20 V and an internal resistance of 1.5 ohms is used to supply power to a heater of resistance 6.5 ohms in a fish tank. What is the power supplied to the water in the fish tank?

What do the substances whose resistance decreases with increase in temperature have?

Which of the following statement is NOT CORRECT about Kirchhoff's rule?

The resistance of a conductor does not depend on which of the following?

A 3V battery is connected in series with ammeter and 2 ohm resistance after short circuiting. What will be the reading of ammeter?

How much potential drop exist across closed switch?

The consumption of energy by a 60 W bulb in 2 s is:

Voltage has the same units as that of?

According to maximum power transfer theorem, which of the following is the max power delivered by the battery to the output?

Which of the following is the fractional change in resistance per kelvin?

A wire of uniform area of cross-section A', length 'L', and resistance R is cut into two equal parts. What will happen to the resistivity of each part?

The resistance of the wire varies inversely as:

The following formula can be used to determine the resistance of a length of conductor . In the formula, the symbol p stands for the:

1kWh= ________ J?

volt × ampere is the measure of:

The resistance of semi-conductor with rise in temperature:

When length of copper wire is doubled then resistivity becomes:

The magnitude of the current in metals is proportional to the potential difference across it as long as the temperature of the conductor is kept constant is known as:

A charge of 90 C passes through a wire for 30 seconds. Then the current in the wire will be:

The reciprocal of the resistivity of a material is called its:

The unit of temperature coefficient of resistivity is

If the length of the conductor is made 4 times its original length, its resistance becomes

Terminal voltage of a cell equals its EMF only when:

If you wish to decrease the resistance of a circuit, you will add the resistors in:

A bulb having a resistance of 150 Ω is connected to a 225-volt source, the current in the bulb will be:

A 100-watt bulb is operated by 240 volts, the current through the bulb will be:

If the switch is closed then the current will flow:

An electric rod of 2000 watts rating boils a certain quantity of water in 10 minutes, the heat generated for boiling this water is:

A battery has an e.m.f. of 4 V and internal resistance 'r'. When this battery is connected to a resistance of 2 ohms, a current of 1 A flows in the circuit. How much current will flow if the terminals of the battery are connected directly:

When a conductor of a cross-sectional area 5x10-6 m² carries a current of 6 A, the drift velocity of the conduction electrons is 1.2 x 10-4 ms^-1. What is the number density (number per unit volume) of the conduction electrons?

For a metallic wire, the ratio V/I (V = applied potential difference, I = current flowing):

A current of 2 ampere flows in a system of conductors as shown in the following figure. The potential difference (VA– VB) will be(in volt) :

When cells are arranged in parallel:

A wire carries a current of 2.0 A. What is the charge that has flowed through its cross–section in 1.0 s. How many electrons does this correspond to?

A galvanometer is an:

Find the resistance if the voltage of a circuit is 45 volts and the current is 30 amperes.

The change in resistance of metallic conductor at a temperature below 0 degrees is:

If a resistor having resistance ‘R’ is cut into three equal parts, then the equivalent of a parallel combination is:

Three 6 Ω are connected as shown in the diagram. What is the resistance between points ‘A’ and ‘B’?

If a voltage of 9V is applied between the ends of a wire whose resistance is 0.2 ohm, what will be the resulting current?

A current of 4.4 amperes is flowing in a wire. How many electrons pass a given point in the wire in one second, if the charge on an electron is 1.6x10-19 Coulomb?

A copper wire has resistances of 10 ohms and 20 ohms at temperatures 0oC and 10oC respectively. What is the temperature coefficient of the copper wire?

The deviation of the I-V graph from a straight line is due to:

When we are measuring the internal resistance of a cell by a potentiometer, the e.m.f of the battery must be greater than the:

Kirchhoff's first law is the manifestation of:

A copper wire has length L and cross-sectional area A. Its resistance is R. If we halved the length and halved the diameter of the wire, then what would be the resistance of this wire?

When resistances are connected in series, the equivalent resistances are equal to:

If in a circuit, 2 ampere current is drawn from the battery in 10 minutes. How much charge will flow through the circuit at this time?

Which of the following is not a unit of power?

Steady current does not change with respect to:

P.D stands for:

In a series circuit, the current remains:

Calculate the charge passing through the circuit if its current is 10 A and the recorded time is 15 seconds.

What is the relationship between power, current, and resistance?

The SI unit of current is:

A galvanometer acting as a voltmeter will have a coil with:

An electrical instrument that is used to measure the potential difference between two points is called:

A relationship exists between current and voltage in terms of Ohm's law. The relation is:

A potential difference of 10V is applied across a conductor whose resistance is 2.5 Ohms. What is the value of the current flowing through it?

EMF becomes equal to the terminal potential difference when:

A battery whose e.m.f is 40 V has an internal resistance of 5 Ohms. If this battery is connected to a 15 Ohms resistor ‘R’, what will be the voltage drop across ‘R’?

The length of the wire is doubled. Its conductance will be:

5 A of current is passed through a metallic conductor. The charge flowing in one minute in coulomb will be:

A typical value of drift velocity is:

A flow of 107 electrons per second in a conductor constitutes a current of:

SI unit of resistivity is:

The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then:

A nichrome wire 50 cm long and one square millimeter cross-section carries a current of 4A when connected to a 2V battery. The resistivity of nichrome wire in ohm meter is:

What can be used as the unit of energy?

The resistance of a cell is 4.2 ohm at 100° C and the temperature coefficient of resistance of its material is 0.004/∘C. Its resistance at 0∘C is:

A bulb has a power of 200W. What is the energy dissipated by it in 5 minutes?

An electric wire is connected across a cell of e.m.f. E. The current 1A is measured by an ammeter of resistance R. According to Ohm's law:

Which of the following bulbs has the least resistance:

A bulb has a current of 200A, and a voltage of 220V. Find Power.

When cells are arranged in parallel :

A dry cell delivering 2 A has a terminal voltage of 1.41V. What is the internal resistance of the cell if its open-circuit voltage is 1.59 V?

The e.m.f of the driver cell in a potentiometer circuit is 10 V. The length of the potentiometer wire is 1 m and its resistance is 9 Ω. A cell of e.m.f 5 V is balanced on the 5/9 m length of the wire. The internal resistance of the driver cell is:

A plausible reason for the increase in resistivity of most of the conductors with temperature is:

If the galvanometer shows null deflection in the given figure then the value of Y is:

Three resistors are arranged as shown. The potential of the point O is:

A 50 Ampere-hour battery can supply a current of 50 A for 1 hour, 25 A for 2 hour, and so on. Then the total energy stored in the 12V-50 Ampere-hour battery is:

A charge passing through a resistor varies with time as shown in the figure. The amount of heat generated in time 't' is best represented (as a function of time) by:

The charge flown through a resistance R in time t varies with time according to Q = at – bt2. The total heat produced in R by the time current becomes zero is:

It is required to measure the equivalent resistance of a circuit with an ideal battery, ideal voltmeter & ideal ammeter. Which circuit diagram shows voltmeter V and ammeter A correctly positioned to measure the total resistance of the circuit?

Two heaters A and B are connected in parallel across the supply voltage. Heater A produces 500 kJ in 20 minutes and B produces 1000 kJ in 10 minutes. The resistance of A is 100 Ω. If the same heaters are connected in series across the same voltage, the heat produced in 5 minutes will be:

The equivalent resistance of the circuit across points A and B is equal to:

In the given circuit diagram, the direction of the conventional current is from:

If an electric iron of 120 ohms operates at 220 V, then the rate of heat developed is equal to:

If a wire of length L and diameter d has a resistance R, then another wire of the same material but having length four times and twice the diameter has the resistance:

If four different resistors are used to pass electric current for different time durations, then which of the following will produce the largest heating effect in joules?

In bringing an electron towards another electron, the electrostatic potential energy of the system will:

If a wire is molded in the form of a ring of radius r which encloses a charge q, then the strength of the electric field at the center of the ring will be:

Which of the following statements is correct for the given diagram?

In the given figure of a resistor, the value of carbon resistance is:

In the given figure, the value of the electric field between the plates is:

The magnitudes of forces on the center charge due to left and right charges are 3.4 N and 4.0 N respectively. What will be the resultant force on the center charge?

What is the energy of a photon in a beam of infrared radiation of wavelength 1240nm?

What shunt resistance must be connected across a galvanometer of 50.0Q resistance Which gives full-scale deflection with 2.0 mA current, to convert it into an ammeter of range 10.0 A?

A platinum wire has a resistance of 10 Ω at 0°C and 20 Ω at 273°C. What is the value of the temperature coefficient of resistance of platinum?

The potential difference between the terminals of a battery in an open circuit is 2.2V. When it is connected across a resistance of 5.0 ohms, the potential falls to 1.8V. What is the current of the battery?

What resistance must be connected across a galvanometer of 50.0 ohm resistance which gives full scale deflection with 2.0MA current to convert it into an ammeter of range 10.0A?

The potential difference between the terminals of the battery in an open circuit is 2.2V. When it is connected across a resistor of 5.0 ohm, the potential falls to 1.8V. What is the current in the battery?

Which of the following is the same unit as the farad?

In the direction indicated by an electric field line:

A wire of resistance 4Ω is bent into a circle. The resistance between the ends of a diameter of the circle is:

A wire of resistance 3.0 Ω is stretched to twice its original length. The resistance of the new wire will be:

A current of 20.0A flows through a battery with an e.m.f of 6.20 V. If the internal resistance of the battery is 0.01, what is the terminal voltage?

The SI unit for resistance is:

_ relationship exists between current and voltage in terms of Ohm's law.

_ potential difference is required for establishing steady current?

The flow of charges produces:

A potentiometer is a device for:

Calculate the work done in a resistor of 20 ohms carrying 5A of current in 3 hours.

In a parallel circuit, the voltage remains:

In a series circuit, current remains?

Ohm's law applies to:

The temperature coefficient of a normal conductor is negative because:

Three resistors of 6 ohms each, can be connected in all possible ways. The highest value of resistance that can be obtained (in ohms) is:

Two lamps are connected in series to a 250 V power supply. One lamp is rated 240 V, 60 W, and the other rated 10 V, 2.5 W. Which statement most accurately describes what happens?

A cell of internal resistance 2.0Ω and electromotive force (e.m.f) 1.5V is connected to a resistor of resistance 3.0Ω. What is the potential difference across the 3.0Ω resistor?

When will 1 C of charge pass a point in an electrical circuit?

The resistance of a device is designed to change with temperature. What is the device?

Two wires A and B are made of the same material. Wire A has a length of I, and a diameter of R while wire B has a length of 2L and a diameter of R/2. If the two wires are stretched by the same force, the elongation in A divided by the elongation in B is:

A car battery has an EMF of 12 volts and an internal resistance of 5 x 10-2 ohms. If it draws 60 ampere current, then the terminal voltage of the battery will be:

The reciprocal of the conductance is called:

When we are measuring the internal resistance of a cell by potentiometer, the emf of the battery must be greater than the :

The power loss 𝑃 in a resistor is calculated using the formula: 𝑃 =𝑉2/R The uncertainty in the potential difference 𝑉 is 3% and the uncertainty in the resistance 𝑅 is 2%. What is the uncertainty in 𝑃?

Four resistors are connected in a square as shown. The resistance may be measured between any two junctions. Between which two junctions is the measured resistance greatest?

A metal cube with sides of length “𝑎” has electrical resistance 𝑅 between opposite faces. What is the resistance between the opposite faces of a cube of the same metal with sides of length 3𝑎?

Which expression using SI base units is equivalent to the volt?

A typical mobile phone battery has an e.m.f. of 5.0 V and an internal resistance of 200 mΩ.What is the terminal P.D. of the battery when it supplies a current of 500 mA?

A filament lamp has a resistance of 180 Ω when the current in it is 500 mA. What is the power dissipated in the lamp?

A resistor of 6 Ω with a tolerance of 10% and another of 4 Ω with a tolerance of 10% are connected in series. The tolerance of combination is about:

When resistances are connected in series, the equivalent resistances is equal to:

12-volt battery is applied across 6-ohm resistance to have a steady flow of current. What must be the required potential difference across the same resistance to have a steady current of one ampere?

Three 6 Ω are connected as shown in the diagram What is the resistance between points ‘A’ and ‘B’

What is the reading of Ammeter as shown in the circuit diagram?

Three resistors of resistance R₁, R₂, and R₃ are connected as shown in the figure.The equivalent resistance is:

Three resistors each having value 'R' are connected as shown in figure. What is the equivalent resistance between 'X' and 'Y'?

If 2 A current passes through a resistor when connected to a certain battery. If the resistance is replaced by double the resistance, then the current will become:

The resistance of a piece of wire is 12 Ω. It is bent to form an equilateral triangle. What is the equivalent resistance between any two corners of the triangles?

If a resistor having resistance ‘R’ is cut into three equal parts, then the equivalent of parallel combination is:

Which combinations of ten identical resistors each of 2 Ω gives rise to the resultant of 10.4 Ω?

If electrons of charge ‘e’, with rest mass ‘m’, are accelerated through a potential difference ‘V’ and strike a metal target, then velocity of electrons is:

When the total resistance in a circuit is Rt = R₁ +R₂ +R₃ +......+Rₙ, the type of circuit is:

Which of the following bulb has the least resistance?

A 200W bulb operates in a 220V circuit. Find the current.

PD stands for _.

The mathematical form of Ohm's law is _.

Electric power is _.

As compared to thin wires, thick wires have _.

If the conductor has a resistance of 50 Ohms and the current passing through it is 5 A, what is the value of potential difference?

Calculate the charge passing through the circuit if it's current is 10 Ampere and the recorded time is 15 seconds:

Maximum power is delivered when internal resistance of the source is equals to _.

An electric filament bulb can work only on a _.

The length of a conductor is halved. Its resistance will be _.

The current passing through a conductor is directly proportional to the potential difference applied across its terminals, provided the temperature and other physical conditions of the conductor does not change.

A current of 5A flows in a resistor of 2 Ohms. Calculate the energy dissipated in 300 seconds in the resistor.

Which of the following is not unit of power?

1 Watt = _.

1 microvolt is _.

A wire of uniform area of cross-section A and length L is cut into two equal parts, the resistivity of each part _.

Resistance of a conductor depends upon _.

Req=R₁+R₂+R₃+...+Rn is the combination in _.

Copper wire is used as connecting wire because _.

An apparatus which is used to measure current, voltage and resistance is _.

What is the power of a bulb if it is operated at 220V and the current in the circuit is 1.5A?

A 220 V main supply is connected to a resistance of 100 k ohms. The effective current is _.

The sensitivity of a potentiometer can be increased by _.

Reciprocal of resistivity is called _.

Find the resistance if voltage of the circuit is 45 volts and current 30 Amp.

Electric current may be defined as -----------------

Resistance of a conductor depends upon

If a current of 5 Amperes flows through the conductor. The number of electrons per second will is

Reciprocal of resistivity is called -----------

The specific resistance of a conductor increases with which of the following?

In parallel voltage remains --------

Two wires of copper are of the same length but have different diameters. When they are connected in series across a battery, the heat generated is H₁ . When connected in parallel across the same battery, the heat generated during the same time is H₂ . Then

Resistivity of a wire is_ohm-m if 0.75 A current flows through it by applying 1.5 V potential difference, take length and cross section as 5m and 2.5 x 10^-7 m^2.

Terminal potential difference of a cell

Ohm's law is valid when the temperature of conductor is

Ohm's Law is applicable only when temperature remains

A wire has a resistance of 5.5 Ω at 19°C and 21.5 Ω at 200°C. Find the temperature coefficient of resistivity(α) of the material.

As compared to thin wires, thick wires have?

The current passing through a resistor in a circuit is 1 A when the voltage across the same resistor is 10 V. What is the value of current when the voltage across the resistor is 8 V?

Four 100 W bulbs are connected in parallel across 200 V supply line. If one bulb gets fused:

The temperature coefficient of resistance is expressed in :

Formula for Power is:

Electric power is:

Electric current may be defined as

The value of current in a short circuit is:

Two copper conductors have equal lengths. The cross-sectional area of one conductor is four times that of the other. If the conductor having a smaller cross-sectional area has a resistance of 40 ohms, the resistance of the other conductor will be

What is the SI Unit of Potential difference?

In a conductor, if a 6-coulomb charge flows for 2 seconds. The value of electric current will be:

In order to achieve high accuracy, the slide wire of a potentiometer should be

Calculate the time taken for the charges to complete the circuit if the total charges were 5000 Coulomb and the current of the circuit was 20Amp?

Which of the following has a negative temperature coefficient of resistance?

1/Req = 1/Rl + 1/R₂ + 1/R₃ + ..... +1/Rn is the combination in

The resistance of a conductor at absolute zero ( 0 K) is

If a cell of emf 2V and internal resistance 0.5 ohm is connected across a resistance R, the current that flows is the same as that when a cell of emf 1.5 V and internal resistance 0.3 ohms is connected across the same resistor. Then R= Ohm.

The condition for the validity under Ohm's law is that?

The resistance of a human body is about?

Kilowatt-hour(kWh) is a unit of?

Current in electrolysis is carried through?

Calculate the time taken for the charges to complete the circuit if the total charges were 5000 Coulomb and the current of the circuit was 20Amp.

The length and radius of electric resistance of a certain wire are doubled simultaneously, then the _.

International ohm is defined in terms of the resistance of _.

Req = R₁ + R₂ + R₃ + ..... + Rn is the combination in _.

Resistivity of a wire is _ ohm-m if 0.75 A current flows through it by applying 1.5 V potential difference, taking length and cross section as 5m and 2.5 x 10^-7 m^2

If a cell of emf 2V and internal resistance 0.5 ohm is connected across a resistance R, the current that flows is same as that when a cell of emf 1.5 V and internal resistance 0.3 ohm is connected across the same resistor. Then R=_Ohm.

If the conductor resistance is 50 ohm and the current passing through it is 5 A. What is the value of potential difference?

Which one of the following does not have negative temperature coefficient?

The condition for the validity of Ohm's law is that the

Resistance of carbon filament lamp _ as the applied voltage increases.

A galvanometer acting as a voltmeter will have a coil with _.

The resistivity of a wire is _ ohm-m if 0.75 A current flows through it by applying 1.5 V potential difference, take length and cross-sectional area as 5m and 2.5 x 10^-7 m^2.

Ohm's law is not applicable to:

The hot resistance of the bulb's filament is higher than its cold resistance because the temperature coefficient of the filament is _.

Ohm's law is true for:

What is the relationship between power, urrent and voltage?

Watt-hour measures _.

Ohm's law is valid at _ temperatures.

When 2 Ω, 4 Ω, and 6 Ω resistors are connected in parallel, their resultant equivalent resistance will be _.

If 1 ampere current flows in 5m conductor for 1 hour, the charge flow will be

A wire has a resistance of 5.5 0 at 19oC and 21.5 0 at 200oC. Find the temperature coefficient of resistivity(a) of the material.

Maximum power delivered by battery is

1 microvolt is

An electric filament bulb can be worked from:

When the length of the conductor is doubled and the area of cross-section remains the same then its resistance

1 kilo ohm = _ ohm

An electrical instrument which is used to measure potential difference between two points is called:

Two wires of copper are of the same length but have different diameters. When they are connected in series across a battery, the heat generated is H₁ When connected in parallel across the same battery, the heat generated during the same time is H₂ then:

Calculate the charge passing through the circuit if it's current is 10 A and the recorded time is 15 seconds.

1 Watt =

Name the branch of science which deals with the study of sound and sound waves?

Steady current does not change with respect to?

What is the power of a bulb if it is operated at 220V and the current in the circuit is 1.5 Ampere?

Is Ohm's law applicable when a bulb is turned on?

A neon flashlight cell with an emf of 1.5V gives a current of 15A when connected directly to an ammeter of resistance 0.040 Ohms. The internal resistance of the cell is?

A _ relationship exists between "current" and "voltage" in terms of the Ohm's law.

Internal resistance of a battery is _ ohm if E = 10V, Vt = 9V, I = 1A.

The resistance of a wire on increasing its temperature will:

The circuit which gives continuously varying potential is called:

A potential difference of 10V is applied across a conductor whose resistance is 2.5 Ohms. What is the value of current flowing through it?

An electric iron is 20V & 500W . The unit consumed by it (in kJ) in using it for 24 hours will be:

Basically a potentiometer is a device for:

In order to achieve accuracy, the slide wire of a potentiometer should be:

EMF becomes equal to terminal potential difference when

A light bulb draws 300 mA when the voltage across it is 240V. The resistance of the light bulb is:

Two incandescent light bulbs of 40 W and 60 W are connected in series across the mains. Then:

A 250 V bulb passes a current of 0.3 A. Calculate the power in the lamp.

Electric power is

Steady current does not change with respect to _

Resistance of a material always decreases if:

PD stands for:

Materials that have both metallic and non-metallic characteristics are called:

All electrical appliances are connected in parallel to each other between the main line and the neutral wire to get:

In a series circuit, the current remains?

A current of 5 Amperes flows in a resistor of 2 Ohms. Calculate the energy dissipated in 300 seconds in the resistor:

Electric current may be defined as the?

A resistance of 40 Ohms is attached to a circuit having a current of 300 Amperes. Find its voltage.

If 1 A current flows through a 2 m long conductor, the charge flowing through it in 1 hour will be?

The electrical power of a battery is defined as the rate of?

All of the following are equivalent to the watt except?

A wire of uniform area of cross-section 'A' and length 'L' is cut into two equal parts. The resistivity of each part is?

A resistance of 40 Ohms is attached to a circuit having current of 300 Amperes. Find the voltage:

The heat sensitive device whose resistivity changes very rapidly with change of temperature is called a:

The mathematical form of ohm's law is:

A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is:

The SI Unit of electric charge is?

Electric current may be defined as:

Maximum power is delivered when internal resistance of the source equals:

Our system stability is least affected by:

SI Unit of current is?

A 200 watt bulb operates in a 220V circuit. Find the current.

Calculate the time taken for the charges to complete the circuit if the total charges were 5000 Coulomb and the current of the circuit was 20 Amp?

The battery of a pocket calculator supplies 0.35A at a potential difference of 6 volts. What is the power of the calculator?

A potentiometer is used to measure the emf of a cell. At null point, no current flows through _.

Calculate the work done in a resistor of 20 ohm carrying 5A of current in 3 hours.

If the length of a potentiometer wire is doubled, the accuracy in determining the null point _.

An immersion heater of 400 watts kept on for 5 hours will consume the electrical power of?

If a certain piece of copper is to be shaped into a conductor of minimum resistance, it is length (L) and cross-sectional area (a) shall respectively be :

In a parallel circuit, the voltage remains the _.

The resistivity of a wire is _ohm-m if 0.75 A current flows through it by applying a 1.5 V potential difference. Take length and cross-section as 5m and 2.5 X 10-7 m².

If the conductor, resistance is 50 ohm and the current passing through it is 5A. What is the value of potential difference?