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प्रश्न
If the potential difference between the end of a wire of fixed resistance is doubled, by how much does the electric power increase?
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उत्तर
We know that power and potential difference are related to each other as given in the equation P = V2/R.
Now, keeping R the same, if V is doubled, power gets increased by four times.
संबंधित प्रश्न
State the relation between potential difference, work done and charge moved.
What do you understand by the term "potential difference"?
What is the potential difference between the terminals of a battery if 250 joules of work is required to transfer 20 coulombs of charge from one terminal of battery to the other?
What is Ohm's law? Explain how it is used to define the unit of resistance.
State the S.I. unit of electric potential.
Which one of the following is the correct set-up for studying the dependence of the current on the potential difference across a resistor and why?
Point out two differences between e.m.f. and potential difference as applied to electric circuits.
Explain why potential difference is always less than the e.m.f. of a cell?
Exercise.
Calculate the amount of charge that would flow in 2 hours through an element of an electric bulb drawing a current of 2.5 A.
If P and V are the power and potential of device, the power consumed with a supply potential V1 is:
