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GCSE Physics > Electricity > Flashcards

Electricity Flashcards

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1
Q

What is the battery?

A

More than one cell

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2
Q

How must an an anmeter to be placed in a circuit?

A

In series

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3
Q

How must a voltmeter be placed in a circus?

A

In parallel to the component

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4
Q

What is needed for charge to flow through a closed circuit?

A

A source of potential difference, e.g. in a cell

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5
Q

Define current

A

The rate of flow of electrical charge

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6
Q

What is equation linking charge current and time?

A

Charge = current X time

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7
Q

Define potential difference

A

The work done when a coulumb of charge passes between two points

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8
Q

What is equation linking potential difference current and resistance?

A

Potential difference = current X resistance

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9
Q

What is a series circuit?

A

The components are in one complete loop

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10
Q

What is a parallel circuit?

A

The components are in more than one loop

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11
Q

How does resistance of a thermistor change as temperature changes?

A

An increase in temperature decreases the resistance

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12
Q

How does resistance of an LDR change as light intensity changes

A

An increase in light intensity decreases the resistance

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13
Q

How does current behave in a series circuit?

A

Same at every point in the circus

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14
Q

How does potential difference behave in a series circuit

A

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

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15
Q

How does resistance behave in a series circuit?

A

Increases with the number of components

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16
Q

How do you calculate the total resistance of a component in series?

A

Add the individual resistances together

R(total) = R1 + R2

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17
Q

How does current behave in a parallel circuit?

A

The current splits to go down different branches and re-joins to go back through the power supply

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18
Q

How does potential difference behave in a parallel circuit?

A

The potential difference across each branch is the same as the power supply

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19
Q

How does resistance behave in a parallel circuit?

A

The total resistance of two resistors is less than the resistance of the smallest, individual resistor

20
Q

How can you measure the resistance of a component?

A

Use an anmeter in series and a voltmeter in parallel to measure the potential difference across and the current through a component

21
Q

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

A

230 V

22
Q

What is the frequency of mains electricity in the UK?

A

50Hz

23
Q

What is direct current?

A

The flow of charge is only in One Direction

24
Q

what is an alternating current?

A

The flow of charge is continually changing direction

25
Q

What is direct potential differences?

A

The potential difference is in One Direction only

26
Q

What is alternating potential difference?

A

The potential difference is continually changing direction

27
Q

What are the three wires inside a plug?

A

Live - brown

Neutral - blue

Earth - green and yellow

28
Q

What are the safety features on a plug?

A

Earth wire, fuse

29
Q

What is power?

A

Rate of energy transfer

30
Q

What is the equation linking power current and potential difference?

A

Power= potential difference X current

31
Q

What is the equation linking power, current and resistance?

A

Power = current2 x resistance

32
Q

What is the equation linking power, energy, and time

A

Power equals energy divided by time

33
Q

What is the equation linking energy charge and potential difference?

A

Energy transferred = charge flow X potential difference

34
Q

What is the national grid?

A

A system of cables and transformers linking power stations to consumers

35
Q

What does step up transformer do?

A

Used to increase the potential difference from the power station to the transmission cables

36
Q

What does a step down transformer do?

A

Used to decrease, to a much lower value, the potential difference for domestic use

37
Q

Why is a high potential difference used to transfer electrical power on the National Grid?

A

Gives a low current. This reduces energy losses through heating, increasing efficiency.

38
Q

How are electrons transferred between materials?

A

Rub together, friction moves electrons from one

39
Q

How does a material become negatively charged?

A

Gains electrons

40
Q

How does the material become positively charged?

A

Loses electrons

41
Q

What happens when two materials covering the same charges are brought close together

A

They repel

42
Q

What happens when two materials carrying a different charger brought closer together?

A

They attract each other

43
Q

Is static charge an example of a non-contact force or a contact force

A

No contact

44
Q

What surrounds a charged object?

A

Electric field

45
Q

What happens to the strength of the electric field with increasing distance from charged object?

A

Get weaker

GCSE Physics (7 decks)

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