Energy and Power Online Test – Multiple Choice Questions and Answers 1. For 12 V and 40 mA, the power is 0.480 W 480 mW 480,000 µW All 2. Three hundred joules of energy are consumed in 15 s. The power is 2 W 20 W 200 W 2000 W 3. A half-watt is equal to how many milliwatts? 5 mW 50 mW 500 mW 5000 mW 4. A given power supply is capable of providing 6 A for 3.5 h. Its ampere-hour rating is 0.58 Ah 58 Ah 2.1 Ah 21 Ah 5. In 0.025 W, there are 25 mW 25 kW 2,500 µW 0.00025 mW 6. At the end of a 14 day period, your utility bill shows that you have used 18 kWh. What is your average daily power? 12.85 kWh 535 kWh 1.286 kWh 252 kWh 7. A certain appliance uses 350 W. If it is allowed to run continuously for 24 days, how many kilowatt-hours of energy does it consume? 2.01 kWh 8.4 kWh 20.16 kWh 201.6 kWh 8. How many watt-hours represent 65 W used for 18 h? 11.7 Wh 11.70 Wh 11.700 Wh 117,000 Wh 9. When the pointer of an analog ohmmeter reads close to zero, the resistor being measured is open shorted reversed overheated 10. A power supply produces a 0.6 W output with an input of 0.7 W. Its percentage of efficiency is 85.7% 42.85% 4.28% 8.57% Loading … Question 1 of 10
