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Physics GCSE > Electricity (10) > Flashcards

Electricity (10) Flashcards

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1
Q

How many wires are there in a plug

A

3

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2
Q

What are the names of the wires in a plug

A

Live wire
Neutral wire
Earth wire

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3
Q

The plug could still work without which wire

A

The earth wire

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4
Q

What does the live wire do

A

Carries the voltage

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5
Q

What does the neutral wire do

A

Completes the circuit

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6
Q

What does the earth wire do

A

Prevents accidents. Safety wire

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7
Q

If an appliance has a plastic casing and no metal parts showing then it said to be ____________ insulated

A

Double

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8
Q

Plastic is an __________ so it stops current flowing

A

Insulator

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9
Q

Where might an appliance not need an earth wire

A

If it is double insulated

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10
Q

All appliances with metal cases must be ___________ to reduce the danger of electric shock

A

Earthed

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11
Q

What does earthing mean

A

The case must be attached to an earth wire

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12
Q

An earthed conductor can never become ___________

A

Live

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13
Q

Name 3 safety precautions you may take when using plugs

A

Check live parts aren’t exposed
Check the cable isn’t frayed
Check there’s no water near by
Never push a metal object into a plug socket

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14
Q

If a fault develops in which the live somehow touches then metal case, the because the case is earthed, a big ___________ flows in through the live wire, through the case and out down the __________ wire. This surge in current blows (melts) the ________ which cuts off the live supply meaning it is impossible to get an electric shock

A

Current
Earth
Fuse

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15
Q

How do circuit breakers work

A

When they detect a surge in current in a circuit, they break the circuit by opening a switch

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16
Q

What is normally the voltage of the live wire

A

230V

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17
Q

What is voltage

A

The difference in charge between 2 points

Basically the driving force that pushes the current round

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18
Q

What is current

A

The rate at which charge is flowing

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19
Q

What is another term for voltage

A

Potential difference

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20
Q

What is the voltage of the the neutral wire

A

0V

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21
Q

Circuit breakers operate __________ than a switch

A

Faster

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22
Q

Why are fuses slower than circuit breakers

A

Because you have to wait for the current to melt the fuse

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23
Q

Normally exactly the same current flows through the ________ and ___________ wires. If you touch the live wire then a small but deadly ___________ will run through you to the _________. This means the neutral wire carries ________ current than the live wire. The circuit breaker detect this difference in current and quickly cut off the power by opening a __________

A 
Live and neutral wires.
Current
Earth
Less
Switch
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24
Q

When there is an electric current in a resistor there is an energy transfer which ________ the resistor

A

Heats

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25
Q

The heating effect increases a resistors _____________ so _________ current will flow, or a ____________voltage will be needed to produce the same current

A

Resistance
Less
Greater

26
Q

Name an advantage of the heating effect on a circuit

A

If you want to heat something e.g. toaster, kettle

27
Q

What is electrical power

A

The rate at which an appliance transfers energy

28
Q

An appliance with a _______ power rating transfers a lot of energy in a short time

A

High

29
Q

An appliance with a high power rating will draw a __________ current from the supply

A

Large

30
Q

What is power measured in

A

Watts

31
Q

What is the formula for electric power

A

P = IV

32
Q

Fuses should be rated as near as possible but just slightly __________ than the normal operating current

A

Higher

33
Q

What is the formula for energy transferred

A

Current x voltage x time

34
Q

What is resistance

A

Anything in the circuit that slows the flow down

35
Q

The relative sizes of the voltage and resistance decide how big the __________ will be

A

Current

36
Q

If you increase the voltage - then _________ current will flow

A

More

37
Q

If you increase the resistance - then _________ current will flow

A

Less

38
Q

An ammeter measures _________ in _____

A

Current in amps

39
Q

Where must an ammeter be placed in a circuit

A

In series

40
Q

A voltmeter measures _________ in ______

A

Voltage in volts

41
Q

Where must a voltmeter be placed in a circuit

A

Parallel around the component under test

42
Q

In the standard test circuit, it doesn’t matter where the components in __________ are

A

Series

43
Q

In __________ circuits, the different components are connected in a line

A

Series

44
Q

In ____________ circuits, each component is separately connected to the +ve and -ve of the supply

A

Parallel

45
Q

In ___________ circuits, you cannot control which components current flows through it either flows through all the components or none of them

A

Series

46
Q

In _____________ circuits, disconnecting a component will hardly affect the others

A

Parallel

47
Q

When drawing a ____________ circuit diagram, all the components will be one after the other along the wire

A

Series

48
Q

When drawing a ___________ circuit diagram, each component is on its own loop circuit. To add a component, just add another loop to the diagram

A

Parallel

49
Q

In __________ circuits, removing or disconnecting one component will break the circuit, stopping all the other components

A

Series

50
Q

Use of series circuits

A

Not very useful

Some christmas lights

51
Q

Use of parallel circuits

A

Household electrics

52
Q

_____________ are always connected in parallel with a component even in a series circuit

A

Voltmeters

53
Q

_____________ are always connected in series even in a parallel circuit

A

Ammeters

54
Q

In _____________ circuits the same current flows through all parts of the circuit. i.e. A1=A2. The size of the current is determined by the total __________ of the cell(s) and the total _______________ of the circuit

A

Series
Voltage
Resistance

55
Q

The total resistance of the circuit depends on the number of ________________ and the type of ________________ used.

A

Components

Component

56
Q

More components = more _____________

A

Resistance

57
Q

Charge can be positive or negative - and when charge flows it is called ____________

A

Current

58
Q

In solid metal conductors (e.g. copper wire), charge is carried by _______________ charged electrons

A

Negatively

59
Q

When current flows past a point in a circuit for a length of time, then the charge that passed is given by this formula:

A 
Charge = Current x Time
Q = I x T
60
Q

More charge passes around a circuit when a ___________ current flows

A

Bigger

61
Q

Charge is measured in __________

A

Coulombs

Physics GCSE (22 decks)

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