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The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100 W and 200 V lamp when not in use?

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Important Questions on Current Electricity

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 68
An electric bulb is rated 220 volt-100 watt. The power consumed by it when operated on 110 volt will be
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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 69
The Kirchhoff's first law (∑i=0) and second law ∑iR=∑E, where the symbols have their usual meanings, are respectively based on:
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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 70
An electric kettle has two heating coils. When one of the coils is connected to an a.c. source, the water in the kettle boils in 10 minutes. When the other coil is used, the water boils in 40 minutes. If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be
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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 71
Two 220 V, 100 W bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220 V a.c. supply line. The power drawn by the combination in each case respectively will be
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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 72
A battery is charged at a potential of 15 V for 8 hours, when the current flowing is 10 A. The battery on discharge supplies a current of 5 A for 15 hours. The mean terminal voltage during discharge is 14 V. The watt-hour efficiency of the battery is:
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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 73
In India electricity is supplied for domestic use at 220 V. It is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in India is R the resistance of a 60 W bulb for use in USA will be
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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 75
Kirchhoff's first and second laws for electrical circuits are consequences of :-
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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 76
When three identical bulb of 60 W- 220 V rating are connected in series to a 220 V supply, the power drawn by them will be