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Electric Circuits

Electric Circuits
A 10 Ohm resistor has power rating of 1W. Find the maximum current rating.

 0.1 A.
 0.01 A.
 0.316 A.
 1 A.

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Electric Circuits
Five cells are connected in series in a row and then four such rows are connected in parallel to Feed the current to a resistive load of 1.25Ω. Each cell has an emf of 1.5 V with internal resistance Of 0.2Ω. The current through the load will be

 3.33 A
 5 A
 23.33 A
 1 A

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Electric Circuits
Which resistor will be physically larger in size?

 100 Ω, 10 W.
 10 Ω, 50 W.
 1 k Ω, 1 W.
 1 M Ω, 1/2 W.

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Electric Circuits
In the given figure, the Thevenins equivalent voltage and impedance as seen from the terminals P - Q is given by

 4 V and 7.5 Ω.
 2 V and 7.5 Ω.
 2 V and 5 Ω.
 4 V and 5 Ω.

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Electric Circuits
A piece of copper and another piece of germanium are cooled from room temperature to 80K. The resistance of

 each of them decreases.
 each of them increases.
 copper increases and germanium decreases.
 copper decreases and germanium increases.

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Electric Circuits
The resistance of a conductor of diameter d and length l is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be

 2R Ω
 8R Ω
 4R Ω
 R Ω

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