Energy and Power Online Test – Multiple Choice Questions and Answers

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

 
 
 
 

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

 
 
 
 

3. In 0.025 W, there are

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

8. 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?

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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