Question

A bulb is rated at 0.5 volt, 5ma calculate its power and resistance​

Answer 1

Explanation:

Complete step by step answer

The rating of the bulb is 5V and 500mA . This means that the bulb works when a voltage of 5V is applied across it and 500mA of current flows through it. Hence, the power dissipated across the torch bulb is equal to 2.5W . Hence, the resistance of the bulb is equal to 10Ω .

Answer 2

Answer:

Given : V=5 volts i=100 mA=0.1 A

(a) : Power P=Vi=5×0.1=0.5 watt

(b) : Resistance R=

P

V

2

=

0.5

5

2

=50 Ω