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GCSE 9-1 Physics revision > Electricity > Flashcards

Electricity Flashcards

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1
Q

Electric current

A

The electric current is the flow of electric charge around a circuit (Amps)

It moves from the negative end of the cell to the positive end of the cell

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2
Q

Series circuit

A

It has no branches. The current can only flow in one path

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3
Q

Measuring current

A

We can measure the current in a circuit by using an ammeter

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4
Q

Is current used up in a circuit

A

Current is never used up in a circuit

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5
Q

Is the current the same or different all the way round the circuit

A

In a series circuit, the current is the same all the way round the circuit

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6
Q

Conventional energy

A

Scientists always draw the current in the opposite direction

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7
Q

Branches

A

A parallel circuit contains branches

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8
Q

Current in a parallel circuit

A

The current in the branches add up to the total current leaving the cell

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9
Q

Coulombs (C)

A

Electrical charge is measured in C

A current of 1 ampere = 1 coulomb of a charge flowing per second

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10
Q

Name 1 thing that stores chemical energy

A

Battery

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11
Q

Potential difference

A

P.D of 1V tells us that 1J of energy is transferred for each coulomb of charge that is moving through the circuit

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12
Q

P.D in a series circuit

A

P.D is split between components

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13
Q

P.D in parallel circuit

A

For components connected in parallel, the p.d across each component is the same

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14
Q

P.d between batteries

A

2 cells = 1 battery

E.g. 1 cell = 6V
1 battery = 12 V

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15
Q

What is a flow of electrons

A

Electric current

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16
Q

What is the current through a resistor

A

Directly proportional to the potential difference

Ohmic conductor

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17
Q

In dark conditions what is the resistance of an LDR (light dependant resistor)

A

High resistance

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18
Q

In the light what is the resistance of the LDR

A

Very low resistance

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19
Q

How much energy does a circuit need to pass through the LDR

A

Very little energy

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20
Q

Thermistor

A

The resistance of a thermistor decreases if the temp increases

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21
Q

In cool conditions what is the resistance of the thermistor

A

High resistance

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22
Q

How much energy does the current need to pass through the thermistor

A

Lot of energy

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23
Q

What is the p.d across the thermistor

A

High

24
Q

What is D.C (direct current)

A

The current from a cell is a d.c

25
Q

What is a A.c (alternating current)

A

Mains power electricity in the UK is an alternating current

The current is constantly changing direction

26
Q

Brown wire

A

Live wire

Carries the alternating potential difference from the supply

27
Q

What is the live wire connected to

A

To the fuse

28
Q

Blue wire

A

Neutral wire

Completes the circuit

P.d=0v compared to the live wire

29
Q

Green/ yellow stripped wire

A

Earth wire

Safety wire to stop the alliance from becoming live

30
Q

Is the live wire dangerous

A

Extremely dangerous and could easily be fatal if touched

They could be electrocuted

31
Q

What does National grid consist of

A

Transformers

High voltage cables

32
Q

What happened when electricity passes through step up transformer

A

Increase pd

Reduces energy lost in the transmission cables

33
Q

What happens to the energy in the power cables when the pd is very high

A

Less energy is lost

34
Q

What happens when electricity pass through step down transformer

A

Reduces pd

35
Q

Electric current

A

The electric current is the flow of electric charge around a circuit (Amps)

It moves from the negative end of the cell to the positive end of the cell

36
Q

Measuring current

A

We can measure the current in a circuit by using an ammeter

37
Q

Is current used up in a circuit

A

Current is never used up in a circuit

38
Q

Is the current the same or different all the way round the circuit

A

In a series circuit, the current is the same all the way round the circuit

39
Q

Current in a parallel circuit

A

The current in the branches add up to the total current leaving the cell

40
Q

Potential difference

A

P.D of 1V tells us that 1J of energy is transferred for each coulomb of charge that is moving through the circuit

41
Q

P.d between batteries

A

2 cells = 1 battery

E.g. 1 cell = 6V
1 battery = 12 V

42
Q

What is a flow of electrons

A

Electric current

43
Q

What is the current through a resistor

A

Directly proportional to the potential difference

Ohmic conductor

44
Q

In dark conditions what is the resistance of an LDR (light dependant resistor)

A

High resistance

45
Q

In the light what is the resistance of the LDR

A

Very low resistance

46
Q

How much energy does a circuit need to pass through the LDR

A

Very little energy

47
Q

Thermistor

A

The resistance of a thermistor decreases if the temp increases

48
Q

In cool conditions what is the resistance of the thermistor

A

High resistance

49
Q

How much energy does the current need to pass through the thermistor

A

Lot of energy

50
Q

What is the p.d across the thermistor

A

High

51
Q

What is Power

A

Power is the rate at which energy is transferred

52
Q

Is the live wire dangerous

A

Extremely dangerous and could easily be fatal if touched

They could be electrocuted

53
Q

What happened when electricity passes through step up transformer

A

Increase pd

Reduces energy lost in the transmission cables

54
Q

What happens to the energy in the power cables when the pd is very high

A

Less energy is lost

55
Q

What happens when electricity pass through step down transformer

A

Reduces pd

GCSE 9-1 Physics revision (5 decks)

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