Brainscape's Knowledge GenomeTM

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


See full index

JJO AQA Electricity > JJO AQA Electricity 1 > Flashcards

JJO AQA Electricity 1 Flashcards

1
Q

What is current?

A

The flow of electric charge
or
How many electric charges pass a point every second

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

What is potential difference?

A

How much energy EACH electric charge picks up or drops off at a component.

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

What piece of equipment is used to measure current?

A

An ammeter

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

What piece of equipment is used to measure potential difference?

A

A voltmeter

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

What is the unit for current?

A

Amps (Amperes)

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

What is the unit for potential differences?

A

Volts

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

What is the unit for resistance?

A

Ohms

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

What causes resistance?

A

Metal ions: Electric charge bumps into metal ions as it moves through components.

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

Charge flow (C) =

A

Current (A) x time (s)

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

What is the unit for charge flow?

A

Coulombs

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

What happens to the current in a circuit if you add more lamps in series?
Explain your answer.

A

It decreases

Because there is more resistance: The electric charge bumps into more metal ions slowing it down.

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

What would happen to the current in a circuit if you increased the number of cells?
Explain your answer.

A

It would increase

Because each electric charge would be given more energy and therefore move faster.

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

Potential difference (V) =

A

Current (A) x resistance (ohms)

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

What happens to the resistance of a thermistor when temperature increases.

A

It decreases.

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

What happens to the resistance of an LDR when light intensity increases?

A

It decreases.

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

Give an example of a device that uses a thermistor.

A

A thermostat.

17
Q

What is the potential difference of the UK electrical supply?

A

230V

18
Q

What colour is the live wire in a plug?

A

Brown

19
Q

What colour is the neutral wire in a plug?

A

Blue

20
Q

What colour is the earth wire in a plug?

A

green and yellow

21
Q

What does the live wire do?

A

Carries the potential difference

22
Q

What does the neutral wire do?

A

Completes the circuit

23
Q

What does the earth wire do and how does it work?

A

It stops the appliance becoming live and giving you an electric shock.
If the live wire touches the metal casing of the appliance the earth wire carries the potential difference away.

JJO AQA Electricity (1 decks)

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