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Current Electricity

Current Electricity
SI unit of power is

Henry
Watt-hour
Watt
Coulomb

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Current Electricity
Electrical current is due to the flow of

Neutral particles only
Both positive and negative charges
Negative charges only
Positive charges only

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Current Electricity
A closed switch has a resistance of

About 500 ohms
Infinity
Zero
About 50 ohms

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Current Electricity
The resistance of a straight conductor is independent of

Temperature
Cross-sectional area
Material
Shape of cross-section

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Current Electricity
Insulators have _______ temperature co-efficient of resistance.

Zero
Negative
Positive
None of the listed here

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Current Electricity
The substances which have a large number of free electrons and offer a low resistance are called

Insulators
Semi-conductors
Inductors
Conductors

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