Question

An instrument is marked with 110V, 100W. How much current will be passed through it for is, what about heat generated. How much is the resistance of this bulb

Answer 1

Solution:

If V=110V and 100W,

I=100/110 = 0.9A

The current produced is 0.9A

If I=0.9, V=110,

R=V/I = 110/0.9 =122ohms(approx)

The resistance of the bulb is 122 ohms

To find the heat dissipated, we will require the time period.