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Current Electricity

Current Electricity
The resistance of conductor varies inversely as

Length
Temperature
Area of cross-section
Resistivity

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Current Electricity
The current in the circuit having constant resistance is tripled. The power increases

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

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Current Electricity
Resistance of a material always decreases if

Temperature of material is increased
Temperature of material is decreased
Number of free electrons available becomes more
None of these

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Current Electricity
The electrical energy required to heat a bucket of water to a certain temperature is 4 kWh. If the heat losses are 20 percent, the energy input is

5 kWh
6 kWh
3.2 kWh
2 kWh

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Current Electricity
Semiconductors have _______temperature co-efficient of resistance.

None of the listed here
Positive
Zero
Negative

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Current Electricity
Two lamps 100 W and 40 W are connected in series across 230 V. Which of the following statement is correct?

40 W lamp will fuse
Both lamps will glow equally bright
100 W lamp will glow brighter
40 W lamp will glow brighter

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