Circuits
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Last updated 9:14 PM on 6/15/23
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61 Terms
1
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What does this symbolise?
Cell
2
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What does this symbolise?
Battery
3
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What does this symbolise?
Open switch
4
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What does this symbolise?
Closed switch
5
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What does this symbolise?
Bulb/lamp
6
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What does this symbolise?
Fuse
7
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What does this symbolise?
LED
8
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What does this symbolise?
DC power supply
9
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What does this symbolise?
AC power supply
10
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What does this symbolise?
Resistor
11
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What does this symbolise?
Variable resistor
12
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What does this symbolise?
Ammeter
13
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What does this symbolise?
Voltmeter
14
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What does this symbolise?
Diode
15
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What does this symbolise?
LDR
16
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What does this symbolise?
Thermistor
17
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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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What kind of graph is this?
Resistor
37
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What kind of graph is this?
Filament lamp
38
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What kind of graph is this?
Diode
39
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What kind of graph is this?
LDR
40
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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
* 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
* 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
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
Note 
Flashcards (65)