A tv has a power of 110 watts and an efficiency of 75 percent. how much power is wasted as heat?

A. 4.4w

B. 82.5w

C. 27.5w

D. 1.5w

The answer is C) 27.5 W

Explanation:

It means that from the 110 Watts it uses 75% to do its job. Therefore we have:

Pu = Power used = 110 * (75/100) = 82.5 watts

82.5 watts are used for the tv work.

And the difference between the total power and the power used is the power wasted as heat.

(110 - 82.5) = 27.5 watts

27.5 watts are dissipated as heat