Question

A car head lamp of 48w works on the car battery of 12v. the correct fuse for the circuit of this car head lamp is

Answer 1

We know that power=V²/R. So, putting the value we get as
48=12²/R. So, R=144/48=3ohm.
Hence the fuse should be atleast of 3 ohm

Answer 2

Answer:

The correct answer is 5 A.