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Current Electricity

Current Electricity
Nichrome wire is an alloy of

Nickel and chromium
Lead and zinc
Copper and silver
Chromium and vanadium

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Current Electricity
In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the resistor is

66 V
132 V
33 V
80 V

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

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

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Current Electricity
The resistance of a copper wire 200 m long is 21 ω. If its thickness (diameter) is 0.44 mm, its specific resistance is around

1.4 x 10-8 ω-m
1.2 x 10-8 ω-m
1.6 x 10-8 ω-m
1.8 x 10-8 ω-m

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Current Electricity
Which of the following statement is true both for a series and a parallel D.C. circuit?

Elements have individual currents
Currents are additive
Voltages are additive
Power are additive

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Current Electricity
Current velocity through a copper conductor is

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

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