A power supply produces a 0.6 W output with an input of 0.7 W. Its percentage of efficiency is

4.28 %

8.57 %

42.85 %

85.7 %

Correct Answer : Option (D) : 85.7 %

Recently Updated in Energy and Power Questions

When the current through a 12 kΩ resistor is 8 mA, the power is

7.68 W

7.68 mW

76.8 W

768 mW

Correct Answer : 768 mW

A given power supply is capable of providing 6 A for 3.5 h. Its ampere-hour rating is

0.58 Ah

2.1 Ah

21 Ah

58 Ah

Correct Answer : 21 Ah

At the end of a 14 day period, your utility bill shows that you have used 18 kWh. What is your average daily power?

1.286 kWh

12.85 kWh

252 kWh

535 kWh

Correct Answer : 1.286 kWh