Question

A torch bulb is rated at 3V and 500mA. Calculate the Power and Resistance of the torch bulb.

Answer 1

Answer:

Here,

$power = votage \times current........(1)$

So, Power = 3×500×0.001 (1mA=0.001A)

=1.5 watt

$power = (voltage)^{2} \div resistance........(2)$

So,

Resistance = 3×3÷1.5

= 6 ohm