Calculate the potential difference required across a conductor of resistance `5 Omega` resistance. It draws a current of `0.3 A` when glowing from a source of `3 V`. Calculate the resistance of the bulb when glowing and explain the reason for the difference in resistance.

Explanation

Here, resistance of the conductor, `R = 5 Omega`
required current, `I = 1.5 A`
If `V` is the potential difference required across the conductor, then `V = IR = (1.5 A)(5 Omega) = 7.5 V`.