Chapter 43 - Uses and Effects of Electricity Flashcards

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1
Q

Direct current

A

Current that flows in one direction only

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2
Q

What devices use direct current?

A

Battery
Mobile phone
Torch

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3
Q

Alternating current

A

Current that flows in a continually changing direction

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4
Q

What devices use alternating current?

A

Plug sockets

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5
Q

_.c can be transmitted over much longer distances than _.c

A

a.c can be transmitted over much longer distances than d.c

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6
Q

What is the average voltage in sockets in homes?

A

230 volts

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7
Q

What is the unit for electrical energy?

A

kilowatt-hour (kWh)

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8
Q

What is the average price of one electrical unit of energy?

A

14 cent

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9
Q

Give examples of the everyday uses of the heating effect of electricity

A

○Boiling water in a kettle
○Immersion heater in a hot press
○In an electrical oven, the grill and oven are used to cook food

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10
Q

Give examples of the everyday uses of the chemical effect of electricity

A

○Electroplating
○Electrolysis
○Recharging your phone creates a chemical reaction in the phone battery. This restores the battery to full power

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11
Q

Give examples of the everyday uses of the magnetic effect of electricity

A

○Electromagnet
○Electric motor
○Speakers

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12
Q

What is electroplating

A

Electroplating is when expensive metal like silver is coated onto a less expensive metal

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13
Q

Fuse

A

A deliberate weak link in a circuit which will break if the current exceeds the preset value

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14
Q

Circuit breaker

A

Safety device that limits the size of the current flowing through a circuit

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15
Q

What is the difference between a fuse and a circuit?

A

○When the wire in a fuse melts, it cannot be reused and must be replaced
○When a circuit breaker turns off the current, all you have to do is push the switch up again

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16
Q

What are the names of the three wires in a plug?

A

Earth
Neutral
Live

17
Q

What colour is the live wire?

A

brown

18
Q

What colour is the neutral wire?

A

blue

19
Q

What colour is the earth wire?

A

green/yellow stripes