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Current Electricity

Current Electricity
If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes

0.4 ohm
0.8 ohm
0.6 ohm
1.0 ohm

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Current Electricity
One commercial unit of energy equals

One watt-hour
Ten kilowatt-hour
One kilowatt-hour
One watt-hour

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Current Electricity
What voltage drop will be there across a 1 kW electric heater whose resistance when hot is 40 Ω?

100 V
200 V
150 V
50 V

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Current Electricity
Are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.

Semiconductors
Thermistor
Variable resistors
Varistors

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Current Electricity
At 0 K, germanium behaves as

A ferromagnetic substance
A conductor
An insulator
A superconductor

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Current Electricity
The hot resistance of the bulb's filament is higher than its cold resistance because the temperature coefficient of the filament is

About 2 ohms per degree
Negative
Zero
Positive

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