Energy and Power Online Test – Multiple Choice Questions and Answers

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

 
 
 
 

2. How many watt-hours represent 65 W used for 18 h?

 
 
 
 

3. For 12 V and 40 mA, the power is

 
 
 
 

4. 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?

 
 
 
 

5. When the pointer of an analog ohmmeter reads close to zero, the resistor being measured is

 
 
 
 

6. In 0.025 W, there are

 
 
 
 

7. A half-watt is equal to how many milliwatts?

 
 
 
 

8. Three hundred joules of energy are consumed in 15 s. The power is

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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