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Question

How much electrical energy in joules does a 100 watt lamp consume :
(a) in 1 second?
(b) in 1 minute?

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Solution

Power of the lamp, (P) = 100 W
(a) Time, (t) = 1 s
Now, we can calculate the electrical energy consumed as:
Energy consumed = Power × Time
So,
Energy consumed = 100 × 1 J
=100 J
So, the energy consumed is 100 J.

(b) Time (t) = 60 s
Now, we can calculate the electrical energy consumed as,
Energy consumed = Power × Time
So,
Energy consumed = 100 × 60 J
=6000 J
So, the energy consumed is 6000 J.

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