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An electric bulb, rated at $100 W$ $230 V$ , is connected to source of $230 V AC$ mains. The bulb is lighted for $100$ days at the rate of $10 h$ per day. What is the cost of light consumed by the bulb, if $1$ unit of electricity costs $50$ paise ?

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Important Questions on Current Electricity

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 11 - Current Electricity>Practice Exercise>Q 29

Two electric bulbs whose resistance are in the ratio

1 : 2

are connected in parallel to a constant voltage source. The power dissipated in them will have the ratio

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 11 - Current Electricity>Practice Exercise>Q 30

In the electrical circuit shown below, what is the effective resistance between points $P$ and $Q$ ?

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 11 - Current Electricity>Practice Exercise>Q 31

If in an electric circuit,

30 C

of charge flow in

5 s

, then the current through it is

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 11 - Current Electricity>Practice Exercise>Q 32

A factory gets its electrical power from a generator

2 km

away. The two wires connecting the generator to the factory terminals have a resistance of

0.04 Ohm {km}^{- 1}

. When the generator supplies

50 A

to the factory, the terminal voltage at the generator is

220 V

. A voltmeter connected to the factory terminal should then read

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 11 - Current Electricity>Practice Exercise>Q 33

The resistance of certain length of a wire having a diameter of

6 mm

5 Ω

. The wire is drawn such that the diameter becomes

3 mm

. The new resistance will be,

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 11 - Current Electricity>Practice Exercise>Q 34

A current of

5 A

is passing through a metallic wire of cross-sectional area

4 \times 10^{- 6} m^{2}

. If the density of the charge carriers in the wire is

5 \times 10^{26} m^{- 3}

, the drift velocity of the electron is,

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 11 - Current Electricity>Practice Exercise>Q 35

A copper wire is stretched to make it

0.1 %

longer. The percentage change in its resistance is,

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 11 - Current Electricity>Practice Exercise>Q 36

A current of $3 A$ flows through a wire shown in figure. The potential difference between points $A$ and $B$ is,

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An electric bulb, rated at 100 W 230 V, is connected to source of 230 V AC mains. The bulb is lighted for 100 days at the rate of 10 h per day. What is the cost of light consumed by the bulb, if 1 unit of electricity costs 50 paise ?

Important Questions on Current Electricity

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An electric bulb, rated at $100 W$ $230 V$ , is connected to source of $230 V AC$ mains. The bulb is lighted for $100$ days at the rate of $10 h$ per day. What is the cost of light consumed by the bulb, if $1$ unit of electricity costs $50$ paise ?