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Current Electricity

Current Electricity
An electrical lamp coonsumes 100 W of power. If the supply voltage is 220 V the energy consumed in 30 minutes is

5 kWh
0.005 kWh
0.05 kWh
5 kWh

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Current Electricity
A copper wire is stretched so that its length is increased by 0.1 % . The change in its resistance is

0.4%
0.2%
None of the listed here
0.3%

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Current Electricity
Voltage dependent resistors are used

As heating elements
To suppress surges
As current stabilizers
For inductive circuits

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Current Electricity
Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be

1/9 times
1/3 times
9 times
3 times

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Current Electricity
Two resistances Rl and Ri are connected in series across the voltage source where Rl > Ri. The largest drop will be across

Ri
Either Rl or Ri
Rl
None of them

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Current Electricity
Temperature coefficient of resistance is expressed in terms of

ohms/ohm°C
mhos/ohm°C
ohms/°C
mhos/°C

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