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Current Electricity

Current Electricity
Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as

5 : 2
25 : 4
2 : 5
4 : 25

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Current Electricity
With rise in temperature the resistance of pure metals

First increases and then decreases
Increases
Remains constant
Decreases

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Current Electricity
Ohm's law is not applicable to

High voltage circuits
Circuits with low current densities
Vaccum tubes
Carbon resistors

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Current Electricity
Resistance of 220 V, 100 W lamp will be

484 ft
4840 Q
48.4 Q
4.84 Q

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Current Electricity
In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the resistor is

66 V
132 V
33 V
80 V

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Current Electricity
The SI unit of power is

Coulomb
Watt
Henry
Watt-hour

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