Brainscape's Knowledge GenomeTM

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


See full index

AQA GCSE Physics 2016on > P2 Electricity > Flashcards

P2 Electricity Flashcards

You may prefer our related Brainscape-certified flashcards:
GCSE Geography - AQA flashcards Physics 101 flashcards GCSE Religious Studies - Edexcel Route B flashcards GCSE Religious Studies - Eduqas Route A flashcards GCSE Religious Studies - Edexcel Route A flashcards GCSE Religious Studies - Eduqas Route B flashcards AP® Physics flashcards
1
Q

What is the National grid?

A

The National Grid is used to distribute electricity around the country from power stations to consumers. It is the network of pylons and wires you see high above you across the country.

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

Current is a measurement of…….

A

……..the rate of charge flow.

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

A step-up transformer steps the voltage up and the current ……….

A

….decreases

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

Explain why transformers are used in the National Grid.

A

Transformers allow the power to stay high because a high voltage means the current can be lowered. This stops the wire getting warm and losing energy to the surroundings.

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

What is AC/DC apart from an Australian rock band?

A

DC = Direct current AC = Alternating Current

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

What is the voltage and frequency of the mains?

A

In the UK, the frequency of mains electricity is 50 Hertz. The voltage of mains electricity supplied to UK homes is 230 V.

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

What is the name and pd of the blue wire?

A

The neutral wire at 0V

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

How would you calculate power?

A

power = current x voltage

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

What is the rule for voltage in series circuits?

A

The voltage from a battery is shared between all the components in a series circuit.

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

What is the rule for current in series circuits?

A

The current has only one route in a series circuit and all ammeters would show identical current.

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

How does the length of a wire affect its resistance?

A

As the length increases the resistance also increases.

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

Why does an increase in temperature in a wire increase its resistance?

A

As a metal heats up their resistance increases because their positive metal ions vibrate more and so block the flow of electrons.

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

What are the steps through the National Grid from the power station to your home or school

A

Electricity from a power station goes to:- Step-up transformers (you will find out about those next) - High-voltage transmission lines/wires - Step-down transformers - Consumers (i.e. your home, school, supermarket)

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

What is the difference between direct current (d.c.), and alternating current (a.c.)?

A

Direct current (d.c.) is an electric current that always flows in one direction. Alternating current (a.c.) is an electric current that is constantly changing direction.

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

Resistance is……..

A

..a measure of how much a conductor prevents the flow of electrons.

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

The voltage of a battery or cell is a measure of …….

A

….the energy given to the electrons so that they can flow around the circuit.

17
Q

How would you calculate electrical energy?

A

electrical energy = power x time

18
Q

What is the equation to find charge?

A

Charge = current x timeQ = It

19
Q

What is the name and job of the green and yellow wire?

A

The earth wire is a safety wire that is needed to earth appliances with a metal case. This makes it safer to touch the appliance if it develops a fault.

20
Q

What is the name and pd of the brown wire?

A

The live wire alternates between a negative and positive voltage of 230V

21
Q

Why are the wires are made of copper?

A

Copper is a good electrical conductor.

22
Q

What is meant by a step-up and step-down transformer?

A

Step-up transformers increase voltage and step-down transformer decrease voltage?

23
Q

What is a transformer?

A

A transformer is a device to change voltage in a circuit.

24
Q

Current is measured in…..

A

…….Amps (short for Amperes).

25
Q

Electrical charge is measured in…..

A

Coulombs

26
Q

What is the rule for current in parallel circuits?

A

The current is shared between all the components in a parallel circuit because there are different routes that the current can take .

27
Q

What equation would you use to calculate voltage?

A

voltage = current x resistance

28
Q

Give an example of a source of a.c. and a source of d.c.

A

Direct current is produced by cells and batteries. Alternating current is produced by most generators and is used in mains electricity

29
Q

What is the rule for voltage in parallel circuits?

A

The voltage from a battery is identical for all the components in a parallel circuit.

30
Q

Give 2 equations to calculate electrical energy?

A

electrical energy = power x timeelectrical energy = charge x voltage

31
Q

What equation links charge, time and current?

A

Q = I x t

32
Q

The units of current are….

A

Amps

33
Q

The units of potential difference are…

A

Volts

34
Q

The units of resistance are…

A

Ohms

35
Q

Current-Voltage Graph for Resistor

A
36
Q

Current-Votlage graph for bulb:

A
37
Q

Current-Voltage Graph for Diode:

A

AQA GCSE Physics 2016on (9 decks)

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