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3NT Chapter 4 Electricity Part III

3NT Chapter 4 Electricity Part III

Assessment

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Physics, Science

8th - 9th Grade

Hard

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22 Slides • 21 Questions

1

3NT Chapter 4 Electricity Part III

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10

Multiple Choice

What does power mean?
1
Joules transferred per second
2
Electron flow per second
3
Speed of electrons
4
Electron energy

11

Multiple Choice

kWh stand for

1

kilowestohm

2

kilometwer

3

kilowatt hour

12

Multiple Choice

What is the SI unit of power?
1
Ampere (A)
2
Volts (V)
3
Joule (J)
4
Watt (W)

13

Multiple Choice

Which of the following is the amount of energy used per unit time?
1
power
2
work done
3
electrical energy

14

Fill in the Blank

An electric water heater uses 10 000 J of energy in 4 s. Calculate the power.

15

Fill in the Blank

A hairdryer with a power of 1.5 kW is used for 10 s.

Calculate the electrical energy needed

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25

Multiple Choice

An air-con, rated 1.8 kW 240 V, is switched on for 10 minutes. Calculate the energy used.

1

1 080 000 J

2

144 000 J

3

2400 J

4

18 J

26

Multiple Choice

A toaster, rated 1500 W 240 V, is switched on for 15 minutes. Calculate the energy used.

1

3600 J

2

22 500 J

3

216 000 J

4

1 350 000 J

27

Multiple Choice

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Calculate the electrical energy used by bulb X in 2 minutes.

1

12 J

2

24 J

3

1440 J

4

720 J

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Multiple Choice

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Calculate the power of bulb X.

1

2 W

2

6 W

3

8 W

4

12 W

29

Multiple Choice

A space heater plugged into a 120 V outlet carries a current of 12.5 amps. The heater is run for 4 hours. How much energy is used by this heater?

1

6000 kWh

2

6 kWh

3

38.4 kWh

4

2.4 kWh

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Fill in the Blank

A 2400 W water heater was used for 15 minutes.

Calculate the electrical energy in kWh consumed by the water heater.

31

Fill in the Blank

A 1200 W iron was switched on for 3 hours.

Calculate the electrical energy consumed by the iron in kWh.

32

Fill in the Blank

A 1.2 kW microwave oven was used for 2 hours.

What is the electrical energy in kWh consumed by the oven?

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Fill in the Blank

A 0.40 kW lamp was turned on for 8 hours.

What is the electrical energy in kWh consumed by the lamp?

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Fill in the Blank

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Calculate the power of the light bulb Q.

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Fill in the Blank

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Calculate the power of the light bulb P.

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39

Multiple Choice

An air conditioner has a power rating of 1200 W. How much energy does it consume in 8 hours?

1

0.15 kWh

2

150 kWh

3

9600 kWh

4

9.6 kWh

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Multiple Choice

An air conditioner has a power rating of 1200 W. Assume that each unit costs 24 cents, what is the cost of using the air conditioner for 8 hours?

1

$0

$0.036

2

$36

3

$2304

4

$2.30

41

Multiple Choice

If you have 26 light bulbs in your home, each 60 watts, how much does it cost to operate them, on average, for 2.5 hours a day, for a month? The cost of electrical energy from the utility company is $0.100496.

1

$391.93

2

$11,578.03

3

$15.07

4

$11.75

42

Multiple Choice

How much does it cost to operate a TV for a month if the TV uses 110 V in a 0.33 amp circuit and is operated for 6 hours a day. The cost per kWH is $0.08112

1

$530.04

2

$4.87

3

$0.02

4

$0.53

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3NT Chapter 4 Electricity Part III

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