Question

a torch bulb is rated 2.5 volt 750 milliampere calculate its power resistance and consumed by the bulb in 4 hour

Answer 1

Hi mate !!

Here's the answer !!

Power = Volt * Current.

Given Current = 750 mA.

1 mA / 1000 = 1 A 

=> 750 mA = 750 / 1000 = 0.75 A.

Voltage = 2.5 V

Power = 2.5 V * 0.75 A

= 1.875 W.

Resistance = Volt / Current

=> Resistance = 2.5 / 0.75 = 3.33 Ω

Energy consumed = Power * time

= 1.875 W * 4 hours

= 7.5 Joules

Hence Power = 1.875 W , Resistance = 3.33 Ω and Energy consumed = 7.5 J.

Hope my answer helped !!

Cheers !!