A television uses 150 w of power. how much energy does it use in 20 seconds?

Energy used by television in 20 seconds = 3000 J

Explanation:

We have expression for power, P = Work / Time

Here we have power of television = 150 Watts

Time of working of television = 20 seconds.

We need to find energy it uses in 20 seconds, that is we need to find work done by electricity in 20 seconds.

Work done = Power x Time = 150 x 20 = 3000 J

Energy used by television in 20 seconds = 3000 J