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Current Electricity

Current Electricity
Out of the following which is not a poor conductor?

Copper
Carbon
Tungsten
Cast iron

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Current Electricity
The resistance of two wires is 25 Ω when connected in series and 6 Ω when joined in parallel. The resistance of each wire is

5 Ω, 10 Ω
10 Ω, 15 Ω
20 Ω, 30 Ω
10 Ω, 20 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 current in the circuit having constant resistance is tripled. The power increases

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

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Current Electricity
Electrical current is due to the flow of

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

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Current Electricity
Electric pressure is also called

Resistance
Voltage
Power
Energy

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