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GCSE Physics paper 1 > Electricity > Flashcards

Electricity Flashcards

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1
Q

State the rule for current in a series circuit

A

the current is the same at every point in the circuit and in every component

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2
Q

State the rule for potential difference in a series circuit

A

the total potential difference of the power supply is shared between components

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3
Q

State the rule for resistance in a series circuit

A

the more resistors, the greater the resistance. RT=R1+R2

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4
Q

State the rule for current in a parallel circuit

A

the total current through the whole circuit is the sum of the currents through the separate components

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5
Q

State the rule for potential difference in a parallel circuit

A

the potential difference across each branch in the circuit is the same

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6
Q

State the rule for resistance in a parallel circuit

A

adding more resistors in parallel decreases resistance

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7
Q

What colour is the live wire in a three core cable?

A

brown

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8
Q

What colour is the neutral wire in a three core cable?

A

blue

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9
Q

What colour is the earth wire in a three core cable?

A

green and yellow

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10
Q

The brown wire in a plug is the _______

A

live

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11
Q

The blue wire in a plug is the ________

A

neutral

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12
Q

The green and yellow wire in a plug is the ________

A

earth

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13
Q

The potential difference between the live wire and others in the plug is _____ V

A

230V

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14
Q

Current flows into an appliance through the _______ wire

A

live

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15
Q

Current flows out of an appliance through the ______ wire

A

neutral

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16
Q

The _________ wire is a safety feature of appliances

A

earth

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17
Q

Potential difference between the neutral wires and others in the plug should be ____ V

A

0V

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18
Q

Electric Current is….?

A

the flow of electric charge

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19
Q

Potential difference between two points in a circuit is….?

A

the work done when a couloumb of charge passes between the points.

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20
Q

In a circuit the potential difference causes …..?

A

charge to flow

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21
Q

Resistance is…?

A

caused by anything which opposes the flow of electric charge

22
Q

Particles which can be ‘charges’ in electric circuits are…

A

electrons or ions

23
Q

What is a series circuit?

A

A circuit with only one route for charge to flow

24
Q

What is a parallel circuit?

A

A circuit with more than one route for charge to flow

25
Q

State the equation which links charge flow, current and time

A

Q=It

26
Q

State the equation which links current, potential difference and resistance

A

V=IR

27
Q

State the equation which links current, potential difference and power

A

P=IV

28
Q

State the equation which links current, power and resistance

A

P=I2R

29
Q

State the equation which links energy transferred, power and time

A

E=Pt

30
Q

State the equation which links charge flow, energy transferred and potential difference

A

E=QV

31
Q

What is the unit of charge flow?

A

Coulomb ( C )

32
Q

What is the unit of current?

A

Amps (A)

33
Q

What is the unit for potential difference?

A

Volts (V)

34
Q

What is the unit for resistance?

A

Ohms (Ω)

35
Q

What is the unit for power?

A

Watts (W)

36
Q

Describe the I-V characteristic for a fixed resistor

A

Current and potential difference are directly proportional, resistance is constant

37
Q

Describe the I-V characteristic of a filament lamp

A

Resistance is not constant, it increases as p.d. increases

38
Q

Explain why resistance increases with increased p.d. in a filament lamp

A

temperature increases causing ions to vibrate and increasing collisions with electrons flowing through the filament

39
Q

Describe the I-V characteristic of a diode

A

The current only flows through the diode in one direction, there is a very high resistance in the reverse direction.

40
Q

Current which regularly changes direction is called…

A

alternating current

41
Q

An example of alternating current is…?

A

mains electricity

42
Q

Current which flows in one direction is…?

A

direct current

43
Q

An example of direct current is…

A

batteries

44
Q

What is the potential difference of mains electricity in the UK?

A

230V

45
Q

What is the frequency of the alternating current in UK mains electricity?

A

50Hz

46
Q

The national grid consists of…?

A

Cables and transformers

47
Q

Are power stations par of the national grid?

A

no

48
Q

What does a step up transformer do?

A

Increases p.d.

49
Q

What does a step down transformer do?

A

reduces p.d. to 230 V

50
Q

Why are transformers used?

A

reduce current so that less heat is lost in cables, increases efficiency

GCSE Physics paper 1 (4 decks)

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