Question

A simple circuit contains an ideal battery and a resistance R. Now if a second resistor (resistance R) is placed in parallel with first resistor, then

• A. potential across R will increase
• B. current through R will increase
• C. power supplied by battery will decrease
• D. power supplied by battery will increase

Answer 1

The correct option is D power supplied by battery will increase

Since $I=\frac{V}{R}$, the current through the first resistor will not change when the second R is put in parallel with it. All that happens is that twice as much current is drawn from the battery when you put the 2nd R in parallel with the first.
$P=V.i$ ($i$ will double)