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Metals are good conductors due to the presence of free electrons.

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Important Questions on Electricity

EASY

Science>Physics>Electricity>Electric Potential and Potential Difference

Define potential difference.

EASY

Science>Physics>Electricity>Electric Potential and Potential Difference

Write the circuit symbol of p-n-p transistor.

MEDIUM

Science>Physics>Electricity>Electric Potential and Potential Difference

What is the meaning of the statement “The potential difference between two points is

1 V

” ? Name the device used to measure potential difference. What is resistance of a conductor? What is electric power? Write three formulae used to find electric power.

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Science>Physics>Electricity>Electric Potential and Potential Difference

‘

X

’ melts at low temperature and is a bad conductor of electricity in both liquid and solid state.

X

is:

MEDIUM

Science>Physics>Electricity>Electric Potential and Potential Difference

Several lamps of

50 W

and

100 V

rating are available. How many of them can be connected in parallel across a battery of a

120 V

of internal resistance

10 Ω

, so that all bulbs glow in full power?

EASY

Science>Physics>Electricity>Electric Potential and Potential Difference

How much work is done in moving a charge of

5 C

across two points having a potential difference

15 V ?

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Science>Physics>Electricity>Electric Potential and Potential Difference

In the given circuit diagram, identify the objects marked as $1, 2, 3$ .

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Science>Physics>Electricity>Electric Potential and Potential Difference

$15$ cells each of emf $2$ volt are connected in series but $2$ of them are connected wrongly. Calculate the emf of the combination.

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Science>Physics>Electricity>Electric Potential and Potential Difference

How much work is done in moving a charge of

3 C

across two points having a potential difference

15 V

EASY

Science>Physics>Electricity>Electric Potential and Potential Difference

How can a continuous flow of current be obtained? What are the sources of energy and name of the devices required for continuous flow of current?

HARD

Science>Physics>Electricity>Electric Potential and Potential Difference

The electronic band of a solid is partially filled. This solid is

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Science>Physics>Electricity>Electric Potential and Potential Difference

Four bulbs

B_{1}

B_{2}

B_{3}

and

B_{4}

100 W

each are connected to

220 V

main as shown in the figure. The reading in an ideal ammeter will be

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Science>Physics>Electricity>Electric Potential and Potential Difference

How much work is done in moving a charge of $2 C$ across two points having a potential difference $10 V$ ?

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Science>Physics>Electricity>Electric Potential and Potential Difference

How much energy is given to each coulomb of charge passing through a

6 V

battery?

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Science>Physics>Electricity>Electric Potential and Potential Difference

In a large building, there are 15 bulbs of 40 W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1 kW. The voltage of the electric mains is 220 V. The minimum capacity of the main fuse of the building will be:

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Science>Physics>Electricity>Electric Potential and Potential Difference

Electric current is flowing from _____.

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