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Current Electricity

Current Electricity
The resistance of a few meters of wire conductor in closed electrical circuit is

Very high
Low
Practically zero
High

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Current Electricity
The resistance of a conductor varies inversely as

Are of cross-section
Resistivity
Temperature
Length

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Current Electricity
Semiconductors have _______temperature co-efficient of resistance.

Zero
None of the listed here
Positive
Negative

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Current Electricity
Temperature coefficient of resistance is expressed in terms of

ohms/°C
mhos/°C
mhos/ohm°C
ohms/ohm°C

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Current Electricity
SI unit of power is

Coulomb
Watt
Watt-hour
Henry

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Current Electricity
Current velocity through a copper conductor is

of the order of a few ^.s/m
nearly 3 x 108 m/s
the same as propagation velocity of electric energy
independent of current strength

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