Question

If the potential difference between the ends of a fixed resistor is halved the electric power will become.

(A) Four times

(B) One-Fourth

(C) Double

(D) Half

Answer 1

According to Ohm's Law,

V = IR or I = V/R

So,when potential difference accross a conductor is halved the current is also halved.
now power across resistor is given by P`=I^2R
Therefore
Power becomes 1/4P
B)one fourth is the answer

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