Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

AQA GCSE - Physics > 2.5 Mains Electricty > Flashcards

2.5 Mains Electricty Flashcards

1
Q

What is direct current?

A

Current that passes round a circuit in one direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is direct current produced by?

A

Batteries
Power supplies
Solar cells

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is alternating current?

A

The current passes in one direction then reverses and passes in the other direction (constantly changing direction)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What type of current is the mains supply?

A

Alternating current

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the frequency of the mains supply?

A

50Hz

Meaning it changes direction 50 times per second

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the voltage of the mains supply?

A

230V

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What can you calculate from an oscilloscope trace diagram?

A

Frequency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

On a 3 pin plug what is the cover made from and why?

A

Plastic

It is a good insulator

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

On a 3 pin plug what are the pins made from and why?

A

Brass
Good conductor
Will not rust

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

On a 3 pin plug what is the blue wire?

A

Calming therefore:

Neutral

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

On a 3 pin plug what is the Brown wire?

A

Chocolate (lively) therefore:

Live

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

On a 3 pin plug what is the yellow green/wire?

A

Natural therefore:

Earth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Which wire does a two core cable not have?

A

An earth wire

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Why do appliances with metal have to be earthed?

A

To prevent electric shocks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Why does a plastic casing not need earthing?

A

It is double insulated

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What does a fuse do?

A

A thin piece of wire that will melt and break if too large a current flows through it

17
Q

How does a fuse melt?

A

The more current the hotter the thin wore will become causing it to melt

18
Q

What is the benefit of having a fuse?

A

It prevents further damage to the appliance or user

19
Q

What is an RCCB?

A

Residual current circuit breaker

20
Q

What does an RCCB do?

A

Compares the current entering the live wire with the current leaving the neutral wire

And if the current is too great it will disconnect the current in the live wire

21
Q

What is the benefit of a RCCB over a fuse?

A

It is much faster

22
Q

What is the waste energy in a filament bulb?

A

Heat

23
Q

Name a bulb where less energy is wasted?

A

Compact fluorescent lamps (CFL’s)

24
Q

To get the best electrical appliance what features should you look for?

A

The most powerful and efficient in transferring energy

25
Q

What energy is transferred to a resistor and what is the result of this?

A

Electrical energy

The resistor heats up

26
Q

What electrical issues can occur?

A

Damage to sockets, plugs, cables or appliances
Overloading sockets leading to fires from over heating
Electric shocks if brought near water

AQA GCSE - Physics (16 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions