Current Electricity

A bulb is made using two filaments.

A switch selects whether the filaments are used individually or in parallel.

When used with a 15 V battery, the bulb can be operated at 5 W, 10 W or 15 W.

What should be the resistances of the filaments?

1 Answers

1161
Akash Anand ·

using V2/R=Power for all the three cases, you will get the result.
The answer should be 15 ohm.

Your Answer

Close [X]