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Electrical Supply

Authored by Lisa Thompson

Science

8th Grade

NGSS covered

Electrical Supply
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15 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

What will be the current drawn by an electric bulb of 1000 W when it is connected to a source of 220 V?
Remember: I = P/V

4.55 A

28800 J or 28.8 KJ

80 W

200 W

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

If the hair dryer and the vacuum cleaner are both on, what is the power used?

2600 watts

400 watts

2200 watts

1100 watts

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Watts is the same as...

Joules per second

Voltage per second

Current per second

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

Calculate the electric power of an electrical appliance in which 10 A of current is flowing through a resistor of 2 ohms.
 
Remember: V=IR and P=VI

80 W

200 W

2.5 A

22.5 KJ

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

If an oven has a power of 2000 W and the voltage is 230 V what fuse is required?

3A

5A

13A

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A pair of 15-watt computer speakers are connected to a 12-volt power supply. What is the electric current running through the speakers?

1.25 A

0.8 A

12.5 A

180 A

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A kilowatt (kW) is how many watts?

10

50

100

1000

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