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P2 > P2.4 > Flashcards

P2.4 Flashcards

1
Q

Mains electricity is…..

A

Useful but can be very dangerous

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2
Q

What do electrical appliances transfer

A

Energy

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3
Q

What is the power of an electrical appliance

A

The rate at which it transforms energy

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4
Q

What do most appliances have printed on them

A

Their power and their potential difference

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5
Q

From the power and the potential difference of an appliance what can we calculate

A

Their current and the fuse they need

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6
Q

What type of current always passes in one direction

A

Direct current

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7
Q

What type of current is supplied by cells and batteries

A

Direct current

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8
Q

What is an alternating current

A

One that is always changing direction

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9
Q

What type of current is the mains electricity

A

An alternating current

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10
Q

What frequency is the mains electricity

A

50 hertz

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11
Q

What is the potential difference of the uk mains electricity

A

230v

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12
Q

What are most mains electricity appliances connected to

A

The mains using cable and three pin plugs

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13
Q

What does it mean if an electrical fault causes too great a current

A

The circuit is disconnected by a fuse or circuit breaker in the live wire

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14
Q

What happens when the current in a fuse wire exceeds the rating of the fuse

A

It will melt and breaks the circuit

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15
Q

What are some circuits protected by

A

Residual current circuit breakers (RCCBs)

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16
Q

How do residual current circuit breakers operate

A

By detecting a difference in the current between the live and neutral wires

17
Q

What operates much faster than a fuse

A

Residual current circuit breakers

18
Q

What are usually earthed

A

Appliances with metal cases

19
Q

Why do some appliances have no earth connection

A

Because they are double insulated

20
Q

What protects the wiring of the wireof the circuit

A

The earth wire and fuse together

21
Q

When does a resistor get hot

A

An electrical charge flows through it

22
Q

What is a lot of energy wasted as in a filament lamp

A

As heat

23
Q

What wastes less energy than a filament bulb

A

Power saving lamps such as compact fluorescent lamps

24
Q

What can be shown on an oscilloscope screen

A

Electricity appliances

25
Q

What is a cathode ray oscillope

A

Voltmeter

26
Q

What happens when u plug a dc supply on a cathode ray oscillope

A

Straight line

27
Q

Likely electrical hazards f

A

Long cables
Water near sockets
Too many plugs into one socket

28
Q

What are three wires in a plug

A

Neutral wire
Live wire
Earth wire

29
Q

How does an earth wire work

A

It is attached to the metal casing of the appliance and carries the electricity to earth and away from u

30
Q

The more current that flows ….

A

The more heat produced

31
Q

What does a bigger voltage mean

A

More heating because it pushes more current through

32
Q

How do filament work

A

They pass a current through a thin wire, heating it up so much that it glows

P2 (6 decks)

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