G482 Revision Ques3ons
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1 G482 Revision Ques3ons Part 1
2 Ques3on 1 Explain what an electric current is
3 Answer 1 Rate of flow of charge
4 Ques3on 2 Define what a conven3onal current is
5 Answer 2 Describes the movement of charge of posi3ve par3cles from + to -
6 Ques3on 3 Describe what is meant by electron flow
7 Answer 3 The movement of electrons from to +
8 Ques3on 4 Define the Coulomb
9 Answer 4 Unit of charge = 1As
10 Ques3on 5 What is the difference between an electric current and an electrolyte?
11 Answer 5 Electric current is electrons moving. Electrolyte current is ions moving
12 Ques3on 6 How do you use an ammeter to measure the current of a circuit?
13 Answer 6 Place an ammeter in series anywhere in the circuit
14 Ques3on 7 What is the charge of an electron?
15 Answer 7 - e=- 1.6x10-19 C
16 Ques3on 8 Define Kirchoff s first law. What is this a conserva3on of?
17 Answer 8 The sum of the currents entering a junc3on is equal to the sum of the currents exi3ng the junc3on. Conserva3on of charge
18 Ques3on 9 State what is meant by mean dri] velocity of charge carriers
19 Answer 9 Average velocity of an electron as it travels through a wire due to a PD
20 Ques3on 10 What is the difference between conductors, insulators and semiconductors?
21 Answer 10 Conductors have a greater number density of electrons
22 Ques3on 11 Define Poten3al difference
23 Answer 11 The amount of energy per charge converted from electrical into another form
24 Ques3on 12 Define EMF
25 Answer 12 The amount of energy per charge converted from one form into electrical
26 Ques3on 13 Define the volt
27 Answer 13 JC - 1
28 Ques3on 14 Describe how you can use a voltmeter to measure the PD of a component
29 Answer 14 Place is around the component (parallel to it)
30 Ques3on 15 Define the Ohm
31 Answer 15 1VA - 1
32 Ques3on 16 State Ohm s law
33 Answer 16 Electric current through a conductor is propor3onal to the PD across it provided physical condi3ons are kept constant (temp)
34 Ques3on 17 Define resistance
35 Answer 17 A property that regulates the amount of current flowing through it R=V/i
36 Ques3on 18 What does the I- V graph look like for an Ohmic device
37 Answer 18
38 Ques3on 19 What does the I- V graph look like for a filament lamp
39 Answer 19
40 Ques3on 20 What does the I- V graph look like for an LED
41 Answer 20
42 Ques3on 21 Describe an experiment to determine the I- V graph of a component
43 Answer 21 Ammeter in circuit, voltmeter around component. Measure PD and current. Change resistance in circuit and repeat. Make graph of results
44 Ques3on 22 Describe an advantage of using LED s
45 Answer 22 Robust, low PD, long life, switch on instantly
46 Ques3on 23 Define the resis3vity of a material
47 Answer 23
48 Ques3on 24 What is the equa3on for resis3vity
49 Answer 24
50 Ques3on 25 Describe how the resis3vity's of metals and semiconductors are affected by temperature
51 Answer 25 Increase temperature it increases resis3vity
52 Ques3on 26 Describe what is meant by the displacement of a wave
53 Answer 26 The distance a point of the wave has from the rest point
54 Ques3on 27 How is the resistance of a wire affect by temperature
55 Answer 27 As you increase the temperature, the resistance decreases
56 Ques3on 28 How is the resistance of a NTC thermistor affected by temperature
57 Answer 28 As you increase the temperature, the resistance decreases
58 Ques3on 29 Describe what power is
59 Answer 29 Rate that electricity is transferred/ work is done
60 Ques3on 30 Explain how a fuse works
61 Answer 30 A piece of wire that melts and breaks a circuit when a high current causes it to heat up
62 Ques3on 31 How do you determine the correct fuse to use?
63 Answer 31 Choosing a current ra3ng that is slightly above the current that the wire will be carrying
64 Ques3on 32 Define what a kilowal- hour is
65 Answer 32 Energy used by a 1kW appliance in 1hour=3.6MJ
66 Ques3on 33 Describe the equa3on to calculate energy in kilowal- hours
67 Answer 33 Energy=Power x 3me Power is measured in kw 3me is measured in hours
68 Ques3on 34 Describe what Kirchoff s second law is. What is it a conserva3on of?
69 Answer 34 The sum of the EMF is equal to the sum of the PD s in a closed loop
70 Ques3on 35 How do you calculate the total resistance of resistors in series?
71 Answer 35 Add the resistances together
72 Ques3on 36 How do you calculate the total resistance of resistors in parallel?
73 Answer 36
74 Ques3on 37 What is meant by internal resistance?
75 Answer 37 There resistance provided by a source of EMF (balery or cell)
76 Ques3on 38 What is meant by the term terminal PD?
77 Answer 38 The PD across the terminals of a balery
78 Ques3on 39 What is the equa3on for EMF including internal resistance?
79 Answer 39 EMF=i(R+r)
80 Ques3on 40 What does a poten3al divider do?
81 Answer 40 A circuit containing 2 components designed to divide the PD up into propor3on to their resistor
82 Ques3on 41 How does the resistance of an LDR change as the light intensity increases?
83 Answer 41 As intensity increases resistance decreases
84 Ques3on 42 Describe an advantage of using data loggers
85 Answer 42 Measurements taken at correct 3me, does not need person there, automa3c readings, less human error
86 Ques3on 43 Describe what a longitudinal wave is
87 Answer 43 Waves where the oscilla3ons are parallel to the direc3on of travel
88 Ques3on 44 Describe what a transverse wave is
89 Answer 44 Waves where the oscilla3ons are perpendicular to the direc3on of travel
90 Ques3on 45 Describe what the amplitude and displacement of a wave is
91 Answer 45 Amplitude = maximum displacement of a point from its rest posi3on
92 Ques3on 46 Describe what frequency and period are for a wave
93 Answer 46 The number of oscilla3ons per unit 3me. The 3me taken for one complete palern of oscilla3on
94 Ques3on 47 What is the wave speed equa3on?
95 Answer 47
96 Ques3on 48 Explain what is meant by refrac3on for light
97 Answer 48 Where light changes direc3on when moving from one medium into another due to a difference in density and wave speed
98 Ques3on 49 Explain what is meant by reflec3on for light and sound
99 Answer 49 Where the wave reflects from a surface
100 Ques3on 50 Explain what is meant by diffrac3on of light and sound
101 Answer 50 Where a wave spreads out when passing around an object or through a gap
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