Question

A torch is rated 5W and 500mA Calculate the power and energy consumed in 4hrs.

Answer 1

Hey!

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Potential difference (V) = 5 V
Current (I) = 500 mA = 0.5A

1.) Power consumed = Potential difference × Current

P = V × I
P = 5 × 0.5
P = 2.5 W

2.) Energy consumed
Time taken = 4 hours = 4 × 3600

Energy = Power × Time
Energy = 2.5 × 4 × 3600
Energy = 36000 J/s

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Hope it helps...!!!