Mains Electricity Flashcards

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0
Q

Alternating current

A

Current repeatedly reverses it’s direction

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1
Q

Direct current

A

Current in one direction only

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2
Q

What are plugs and sockets made of

A

Thermosetting plastic because they are good electrical insulators

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3
Q

Why are the pins on a plug made of brass

A

Brass is a good conductor of electricity

It will not rust or oxidise

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4
Q

What is the earth wire connected to

A

Longest pin at the top

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5
Q

What does the earth wire look like

A

Green and yellow striped

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6
Q

What is the blue wire and what is it connected to

A

Neutral wire connected to the neutral pin

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7
Q

What is the brown wire and what is it connected to

A

Live wire connected to the live pin

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8
Q

Appliances with metal cases must be earthed why

A

Because it’s not double insulated

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9
Q

Fuse

A

Cuts the appliance off from the live wire if the fuse blows

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10
Q

What can electrical faults cause

A

Electrical shocks and fires

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11
Q

Why are filament bulbs very inefficient

A

They don’t last very long

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