Electricity Calculations

Electricity Calculations

9th Grade

5 Qs

quiz-placeholder

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Electricity Calculations

Electricity Calculations

Assessment

Quiz

Physics, Science

9th Grade

Practice Problem

Medium

Created by

Leah Baiton

Used 41+ times

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5 questions

Show all answers

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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