Question

A lamp consumer 10y of electrical energy in 20 seconds what is power

Answer 1

I think you wanted to write 10 J instead of 10 y

Given :

Electrical energy ( W ) = 10 J

Time ( t ) = 20 s

Power = Work / time

           = 10 J / 20 s

            = 1 / 2 J /s

            = 0.5 J / s

The power will be 0.5 J/s

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Answer 2

Formula- power= work/t