Question

The wattage of a bulb is 24w when it is connected to a 12 v battery.Calculate its effective wattage if it operates on a 6 v battery

Answer 1

P=VI

CASE-I;

Given , p=24 , v=12

I=P/V

=24/12

I=2A

CASE-2

Given, P=24

P=VI

 =6^2

P =12W