A laptop can convert 400J of electrical energy into a 240J of light and sound. What is the efficiency? Where does the rest of th

Question

poizon [28]

3 years ago

12

A laptop can convert 400J of electrical energy into a 240J of light and sound. What is the efficiency? Where does the rest of th

e energy go?

Physics

1 answer:

Blababa [14] · Answer 1 · 2022-04-29T09:47:14+03:00

Efficiency = (Wanted) energy out ÷ energy in × 100

Energy in = 400J
Wanted Energy out = 240J

Energy cannot be used up, only transferred, so the remaining energy is most likely to be transferred into unwanted energy (loss of energy) such as heat energy.

Efficiency = 240 ÷ 400 × 100
Efficiency = 0.6 × 100
Efficiency = 60%