Electricity Calculations
Quiz
•
Physics, Science
•
9th Grade
•
Practice Problem
•
Medium
Leah Baiton
Used 41+ times
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Calculate the energy released from a battery in a hand vacuum cleaner that was switched on for 45 s. The voltage drop was 6 V and the current was 0.30 A.
35 J
81 J
42 J
82 W
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Calculate the power rating of an electric toaster that uses 210 000 J while toasting bread for 140 s
1500 J
1200 W
1500 W
1300 J
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Calculate the percent efficiency of an electric motor that uses 15 000 J of energy to produce
11 500 J of useful movement.
76.6%
82.3%
75.4%
23.3%
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Calculate the energy used by a coffee maker that has a power rating of 0.900 kW and operated for 17 hours.
15.3 kwh
17.3 kwh
900 kwh
1200 kw
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Calculate the cost of operating a heater of 1.75kw for 20 hours at rate of $0.13 per kwh?
$6.75
$4.55
$53.43
$45.53
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