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Current Electricity

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

Input power
kWh consumed
True component of power
Losses

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Current Electricity
Ohm's law is not applicable to

Carbon resistors
Circuits with low current densities
High voltage circuits
Vaccum tubes

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Current Electricity
Two resistances Rl and Ri are connected in series across the voltage source where Rl > Ri. The largest drop will be across

Ri
None of them
Rl
Either Rl or Ri

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Current Electricity
Semiconductors have _______temperature co-efficient of resistance.

Zero
Positive
Negative
None of the listed here

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Current Electricity
In a lamp load when more than one lamp are switched on the total resistance of the load

Remains same
Increases
Decreases
None of these

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Current Electricity
E. M. F. In a circuit

Decrease circuit resistance
None of the listed here
Maintains potential difference
Increases circuit resistance

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