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Current Electricity

Current Electricity
A copper wire has a resistance of 10 Ω. It is stretched by one-tenth of its original length. Then its resistance will be

9 Ω
12.1 Ω
10 Ω
11 Ω

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Current Electricity
If the efficiency of a machine is to be high, what should be low?

True component of power
Input power
kWh consumed
Losses

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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

Positive
Zero
Negative
About 2 ohms per degree

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Current Electricity
The thickness of insulation provided on the conductor depends on

The magnitude of current flowing through it
None of the listed here
The magnitude of voltage on the conductor
Both magnitude of voltage and current

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Current Electricity
The SI unit of power is

Watt-hour
Henry
Watt
Coulomb

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Current Electricity
If the number of valence electrons of an atoms is less than 4,the substance is usually

An insulator
None of the listed here
A semiconductor
A conductor

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