Energy and Power Online Test – Multiple Choice Questions and Answers

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

5. 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?

 
 
 
 

6. In 0.025 W, there are

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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