(2) Domestic Uses and Safety Flashcards

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1
Q

Define AC

A

AC stands for alternating current - the current changes direction (50 times a second)

• the mains supply is the uk is AC

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2
Q

Define DC

A

DC stands for direct current- the current only flows in one direction

• Batteries and cells supply DC

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3
Q

What is the frequency and voltage of the uk mains electricity?

A

Frequency = 50Hz
Voltage = 230V

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4
Q

What are the wires in a plug?

A
  1. Live wire
  2. Neutral wire
  3. Earth wire
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5
Q

State the insolation colour used on the 3 wires in a plug

A

Live wire = Brown
Neutral wire = Blue
Earth wire = green and yellow stripes

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6
Q

How do fuses work?

A

Fuses have a rating based on the amount of current they will allow through, if more than this tries to flow through the wire heats up and melts, breaking the circuit and protecting the appliance

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7
Q

What is a circuit breaker?

A

Circuit breakers measure the difference in current in the live and neutral wires, if the difference is too great they stop the flow of current

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8
Q

When does the Earth wire carry a current?

A

• normally there is no current flowing through

• of a fault occurs in the appliance, current will flow to the ground

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9
Q

Sate the potential difference between the live and earth wires

A

230 volts

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10
Q

What is the purpose of the neural wire?

A

To complete the circuit by connecting the appliance to the mains supply

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11
Q

What is the potential difference of the neutral wire?

A

0 volts

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12
Q

How do you work out frequency?

A

Frequency = 1 ÷ how long 1 wave takes

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13
Q

For metal appliances, where is the earth wire connected to?

A

It’s connected to the metal casing of the appliance so that if the live wire becomes loose and touches the casing the current will flow thought the earth wire, preventing electrocution

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