Physics Crash Course JEE Main>Chapter 14 - Current Electricity>Level 1>Q 36

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IMPORTANT

Earn 100

The drift velocity of electrons in a conducting wire is of the order of $1 mm s^{- 1}$ . Yet the bulb glows very quickly after the switch is put on because

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Important Questions on Current Electricity

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IMPORTANT

Physics Crash Course JEE Main>Chapter 14 - Current Electricity>Level 1>Q 37

When current flows through a conductor, then the order of drift velocity of electrons will be:

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Physics Crash Course JEE Main>Chapter 14 - Current Electricity>Level 1>Q 38

A battery is charged at a potential of

15 V

in

8 h

when the current flowing is

10 A

. The battery on discharge supplies a current of

5 A

for

15 h

. The mean terminal voltage during discharge is

14 V

. The watt-hour efficiency of battery is(in %)

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Physics Crash Course JEE Main>Chapter 14 - Current Electricity>Level 1>Q 39

The voltage of clouds is

4 \times 10^{6}

V

with respect to ground. In a lightning strike lasting

100 ms

a charge of

4 C

is delivered to the ground. The power of lightening strike is

x MW

, what is the value of

x

?

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Physics Crash Course JEE Main>Chapter 14 - Current Electricity>Level 1>Q 40

A

5 A

current is set up in an external circuit by a

6.0 V

storage battery for

6.0 \min

. The chemical energy of the battery is reduced by

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Physics Crash Course JEE Main>Chapter 14 - Current Electricity>Level 1>Q 41

All bulbs in the figure are identical. Which bulb lights more brightly?
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Physics Crash Course JEE Main>Chapter 14 - Current Electricity>Level 1>Q 42

What will happen when a

40 W, 220 V

lamp and

100 W, 220 V

lamp are connected in series across a

40 V

supply?

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Physics Crash Course JEE Main>Chapter 14 - Current Electricity>Level 1>Q 43

Some electric bulbs are connected in series across a $220 V$ supply in a room. If one bulb is fused, then remaining bulbs are connected again in series across the same supply. The illumination in the room will:

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Physics Crash Course JEE Main>Chapter 14 - Current Electricity>Level 1>Q 44

How many electrons flow per second through an electric bulb rated

220 V, 100 W

?