Power Calculations

Quiz
•
Science
•
9th Grade
•
Hard
+2
Standards-aligned
Lisa Thompson
FREE Resource
25 questions
Show all answers
1.
FILL IN THE BLANK QUESTION
1 min • 5 pts
An alarm clock draws 0.5 A of current when connected to a 120 volt circuit. What amount of power is used by the alarm clock?
2.
FILL IN THE BLANK QUESTION
1 min • 5 pts
A subwoofer needs a household voltage of 110 V to push a current of 5.5 A through its coil. What is the power used by the subwoofer?
3.
FILL IN THE BLANK QUESTION
1 min • 5 pts
If a toaster produces 12 watts of power in a 120-volt circuit, what is the amount of current in the circuit?
4.
FILL IN THE BLANK QUESTION
1 min • 5 pts
An electric heater works by passing a current of 50 A though a coiled metal wire, making it red hot, and uses 120 W of power. What voltage must be applied to run the heater?
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of these is a measurement of power?
100 joules
100 watts
100 meters per second
100 hertz
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
You do 90 joules of work in 30 seconds. How much power have you generated?
30 watts
3 watts
120 watts
270 watts
Answer explanation
Power is calculated as work done divided by time. Here, power = 90 joules / 30 seconds = 3 watts. Therefore, the correct answer is 3 watts.
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Electrical power can be calculated using
Resistance x Voltage
Voltage x Current
Voltage ÷ Current
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