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9RFO > Combined Physics - P2 Electricity > Flashcards

Combined Physics - P2 Electricity Flashcards

1
Q

What is the circuit symbol for an open switch?

A
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2
Q

What is the circuit symbol for a closed switch?

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3
Q

What is the circuit symbol for a cell?

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4
Q

What is the circuit symbol for a battery?

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5
Q

What is the circuit symbol for a diode?

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6
Q

What is the circuit symbol for a resistor?

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7
Q

What is the circuit symbol for a variable resistor?

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8
Q

What is the circuit symbol for an LED?

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9
Q

What is the circuit symbol for a lamp?

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10
Q

What is the circuit symbol for a fuse?

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11
Q

What is the circuit symbol for a voltmeter?

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12
Q

What is the circuit symbol for an ammeter?

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13
Q

What is the circuit symbol for a thermistor?

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14
Q

What is the circuit symbol for an LDR?

A
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15
Q

What is current?

A

The rate of flow of charge

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16
Q

What component is the IV graph in the image for?

A

A Resistor (at constant temperature)

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17
Q

What type of circuit is shown in the image?

A

Series circuit

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18
Q

What component is the IV graph in the image for?

A

A diode

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19
Q

What type of circuit is shown in the image?

A

Parallel circuit

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20
Q

What component is the IV graph in the image for?

A

A filament lamp

21
Q

What happens to the resistance of a thermistor as temperature increases?

A

Resistance decreases

22
Q

What happens to the resistance of an LDR as light increases?

A

Resistance decreases

23
Q

What’s the difference between direct current and alternating current?

A
  • Direct current flows in only one direction.
  • Alternating current constantly changes direction.
24
Q

What is the rule for current in a series circuit?

A

Current is the same everywhere in the circuit

25
Q

Name the electrical component used in thermostats.

A

Thermistor

26
Q

Where are LDRs commonly found?

A

LDRs are used as automatic night lights

27
Q

What is the National Grid?

A

A system of cables and transformers

28
Q

What is the rule for potential difference in a series circuit?

A

Potential difference is shared between components.

29
Q

Where should you place an ammeter to measure current through a component?

A

The ammeter should be placed in series with the component.

30
Q

What is the rule for potential difference in a parallel circuit?

A

It is the same in each branch.

31
Q

Where should you place a voltmeter to measure potential difference across a component?

A

The voltmeter should be placed parallel to the component.

32
Q

What type of electricity supply is a battery?

A

Direct current (DC)

33
Q

What is the total resistance of the three resistors in series?

A

25 Ω

34
Q

What is the rule for current in a parallel circuit?

A

Current is shared between the branches.

35
Q

What type of electricity supply is mains electricity?

A

Alternating current (AC)

36
Q

Name the equipment used to measure potential difference.

A

Voltmeter

37
Q

What is the frequency of mains electricity?

A

50 Hz

38
Q

Name the three wires in a three-core cable and say what colour they are.

A
  • Live wire (brown)
  • Neutral wire (blue)
  • Earth wire (green / yellow striped)
39
Q

What is the function of the neutral wire (blue)

A

Completes the circuit carrying current away (0 V)

40
Q

What is the potential difference of mains electricity?

A

230 V

41
Q

What is the function of the live wire (brown)?

A

Provides the alternating potential difference (230V)

42
Q

What is the function of the Earth wire (green / yellow)?

A

Acts as a safety device, stopping the appliance casing from becoming live (0 V)

43
Q

What two things determine how much energy is transferred by an electrical appliance.

A
  • How long the appliance is on for
  • The power rating of the appliance
44
Q

Describe how electricity is transmitted across the National Grid to make it as efficient as possible.

A
  • High potential difference
  • Low current
  • Which decreases energy lost by heating the wires/surrounding
45
Q

How are step-down transformers used within the National Grid?

A

Step-down transformers bring the 400,000 V of the National Grid down to 230 V for use in the home.

46
Q

Name the equipment used to measure current.

A

Ammeter

47
Q

How are step-up transformers used within the National Grid?

A

Step-up transformers increase the potential difference of the National Grid to 400,000 V

48
Q

Sketch a graph to show how light intensity affects resistance in an LDR.

A
49
Q

Sketch a graph to show how temperature affects resistance in a thermistor.

A

9RFO (6 decks)

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