Question

A torch bulb is rated at 1.5v 500ma . find the resistance

Answer 1

Here,
V, Potential Difference = 1.5 V
Current, I = 500 * 10^ (-3) = 0.5A

By Ohm/s Law,
V = IR
=> 1.5 V = 0.5 R
=> R = 3ohm

Therefore, Internal Resistance of Bulb is 3ohm.