Circuits (copy)

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61 Terms

1
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<p>What does this symbolise?</p>

What does this symbolise?

Cell

2
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<p>What does this symbolise?</p>

What does this symbolise?

Battery

3
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<p>What does this symbolise?</p>

What does this symbolise?

Open switch

4
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<p>What does this symbolise?</p>

What does this symbolise?

Closed switch

5
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<p>What does this symbolise?</p>

What does this symbolise?

Bulb/lamp

6
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<p>What does this symbolise?</p>

What does this symbolise?

Fuse

7
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<p>What does this symbolise?</p>

What does this symbolise?

LED

8
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<p>What does this symbolise?</p>

What does this symbolise?

DC power supply

9
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<p>What does this symbolise?</p>

What does this symbolise?

AC power supply

10
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<p>What does this symbolise?</p>

What does this symbolise?

Resistor

11
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<p>What does this symbolise?</p>

What does this symbolise?

Variable resistor

12
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<p>What does this symbolise?</p>

What does this symbolise?

Ammeter

13
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<p>What does this symbolise?</p>

What does this symbolise?

Voltmeter

14
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<p>What does this symbolise?</p>

What does this symbolise?

Diode

15
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<p>What does this symbolise?</p>

What does this symbolise?

LDR

16
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<p>What does this symbolise?</p>

What does this symbolise?

Thermistor

17
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<p>What does this symbolise?</p>

What does this symbolise?

Motor

18
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What is current?

Flow of electrical charge

19
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What is current measured in?

Amperes

20
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What is potential difference?

Driving force that pushes the charge

21
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What unit is potential difference measured in?

Voltage

22
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What is resistance?

Anything that slows the current down

23
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What is resistance measured in?

Ohms

24
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In metals, what is current caused by?

Flow of electrons

25
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What is charge measured in?

Coulombs

26
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What is the symbol for amperes?

I

27
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What is energy measured in?

Joules

28
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What is the symbol for voltage?

V

29
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What happens to resistance (usually) when temperature increases?

Increases

30
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When resistance increases, what happens to current?

Decreases

31
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How does resistance work?

Current has to do work against it and therefore slows down

32
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What does the work done against resistance cause?

Transfer of energy of which some is useful and some is dissapated

33
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When a current flows through a resistor, what happens to its temperature?

Heats up

34
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Why does the resistor heat up when current flows through it?

Electrons collide with the ions and then the ions gain energy, vibrate, heat up, and makes it harder for the electrons to get through the resistor

35
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What happens to the resistance of a thermistor as temperature increases?

Decreases

36
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<p>What kind of graph is this?</p>

What kind of graph is this?

Resistor

37
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<p>What kind of graph is this?</p>

What kind of graph is this?

Filament lamp

38
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<p>What kind of graph is this?</p>

What kind of graph is this?

Diode

39
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<p>What kind of graph is this?</p>

What kind of graph is this?

LDR

40
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<p>What kind of graph is this?</p>

What kind of graph is this?

Thermistor

41
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What does LDR depend on?

Light

42
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What happens to LDR resistance in bright light?

Low

43
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What happens to LDR resistance in darkness?

High

44
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What are LDR’s used for?

  • Automatic night lights

  • Outdoor lighting

  • Burglar detectors

45
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What is thermistor dependent on?

Temperature

46
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What happens to thermistor resistance if the temperature is cool?

High

47
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What happens to thermistor resistance if the temperature is hot?

Low

48
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What are thermistors used for?

  • Thermostats

  • Car engine temperature sensors

49
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What is a series ciruit?

Current flows through one pathway

50
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What is a parallel circuit?

Current flows through more than one pathway

51
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What happens to a series circuit if you remove one component?

It will stop working

52
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What happens to a parallel circuit if you remove one component?

Won’t affect the others at all

53
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How are voltmeters always connect to a circuit - no matter what?

Parallel

54
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What happens to current in a parallel circuit?

It is distributed across components

55
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What happens in a junction of a parallel circuit?

Current splits or rejoins

56
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Does the total current entering a junction equal total current leaving?

Yes

57
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What happens in a series circuit when a resistor is added?

Total resistance increases

58
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What happens in a parallel circuit when a resistor is added?

Total resistance decreases

59
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The larger the current the ____ energy transferred:

a. More

b. Less

More

60
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What happens to efficiency usually when a component is heated?

Reduced

61
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Can components in a circuit melt?

Yes