Question

Keeping the power same of the source if I is increased, then will V increase or decrease? Does it violate Ohm’s law? If not, justify your answer. Give an example where the same principle is applied in our daily life.​

Answer 1

Hey dear,

◆ Answers with explaination -

Let me answer your queries one by one.

Voltage in the circuit is given w.r.t. power & current as -

V = P / I

If power of the source is kept same, increase in current will decrease the voltage.

V ∝ 1/I

But, according to Ohm's law, V ∝ I. So you may think it violates Ohm's law, but it doesn't. This is because Ohm's law when circuit (resistance) remains same, which clearly doesn't in maintaining same power.

Example - Transformer

In transformers, power is kept constant while voltage & current are interchangeable. In step-up transformer, voltage increases as current decreases. In step-down transformer, voltage decreases as current increases.

Thanks for asking...