Question

If voltage in a circuit is constant, the current can be cut to half of its original value by changing the resistance to?

Answer 1

The answer is 2 times

Answer 2

Answer: Twice its original value.

Explanation:

From Ohm's law, current is directly proportional to the voltage.

I ∝ V

V = I R

Keeping voltage constant, Current is inversely proportional to resistance.

I ∝ 1/R

$V = \frac{I}{2}R'\\ \Rightarrow R'= \frac{2V}{I} =2 R$

When current is cut to half the original, the resistance should be increased to twice its original value to keep the voltage constant.