Question

200J of energy is supplied to a machine which Is 40% efficient, the amount of energy lost is:
A. 200 J
B. 120 J
C. 80J
D. 160J

Answer 1

Answer:

B is the correct answer

Answer 2

120 J is correct answer

200J =100%,

?=40% ,

20J =10%,

50%=100J,

40%=50%-10%,

100J-20J=40%,

80J is used,

therefore=200J-80J is amount of energy lost .

120J is amount of energy lost.