Question

When two identical resistors are connected in series across ideal battery, total power dissipated by them is P. Now both are connected in parallel and same battery is connected across the combination. Now find the total power dissipated by both of them.

Answer 1

Answer:

4 P

Explanation:

V = IR

     when they are in series   R = 2 r

     when they are in parallel R = 1/2 r

         so current will increase by a factor of 4  when they are in parallel

              and power used will also increase by a factor of 4  to  4 P

Power = IV       when I now becomes 4 I     power becomes 4 P