GCSE SCIEN
CE: Physics 2. ElectricitySection 1: Circuit Symbols
1Draw the circuit symbol for a switch
2Draw the circuit symbol for a closed switch
3Draw the circuit symbol for a cell
4Draw the circuit symbol for a battery
5Draw the circuit symbol for a diode
6Draw the circuit symbol for a resistor
7Draw the circuit symbol for a variable resistor
8Draw the circuit symbol for an LED
9Draw the circuit symbol for a lamp
10Draw the circuit symbol for a fuse
11Draw the circuit symbol for a voltmeter
12Draw the circuit symbol for an ammeter
13Draw the circuit symbol for a thermistor
14Draw the circuit symbol for an LDR
Section 2: Current, Potential difference & Resistance15 Electric Current is….? the flow of electric charge
16 Potential difference between two points in a circuit is….?
the work done when a couloumb of charge passes between the points.
17 In a circuit the potential difference causes …..?
charge to flow
18 Resistance is…? caused by anything which opposes the flow of electric charge
19 Particles which can be 'charges' in electric circuits are…
electrons or ions
20 What is a series circuit? A circuit with only one route for charge to flow
21 What is a parallel circuit? A circuit with more than one route for charge to flow
22 State the equation which links charge flow, current and time
Q=It
23 State the equation which links current, potential difference and resistance
V=IR
24 What is the unit of charge flow? Coulomb ( C )
25 What is the unit of current? Amps (A)
26 What is the unit for potential difference? Volts (V)
27 What is the unit for resistance? Ohms (Ω)
28 State the rule for current in a series circuit
the current is the same at every point in the circuit and in every component
29 State the rule for potential difference in a series circuit
the total potential difference of the power supply is shared between components
30 State the rule for resistance in a series circuit
the more resistors, the greater the resistance. RT=R1+R2
31State the rule for current in a parallel circuit
the total current through the whole circuit is the sum of the currents through the separate components
32 State the rule for potential difference in a parallel circuit
the potential difference across each branch in the circuit is the same
33 State the rule for resistance in a parallel circuit
adding more resistors in parallel decreases resistance
EQUATIONS TO LEARN!ℎ#$%& '()* = !,$$&-. × .01&2).&-.0#( 3044&$&-5& = !,$$&-. × 6&707.#-5&8- # 7&$0&7 50$5,0.; :).#( 6&707.#-5& = ;,1 )4 .ℎ& 0-30<03,#( 6&707.#-5&7
GCSE SCIEN
CE: Physics 2. ElectricitySection 3: Current & Potential difference Characteristics
34
Draw the I-V characteristic for a fixed resistor
35
Draw the I-V characteristic for a filament lamp see
36
Draw the I-V characteristic for a diode
37Describe the I-V characteristic for a fixed resistor
Current and potential difference are directly proportional, resistance is constant
38Describe the I-V characteristic of a filament lamp
Resistance is not constant, it increases as p.d. increases
39Explain why resistance increases with increased p.d. in a filament lamp
temperature increases causing ions to vibrate and increasing collisions with electrons flowing through the filament
40Describe the I-V characteristic of a diode The current only flows through the diode in
one direction, there is a very high resistance in the reverse direction.
Section 4: Power41 What is the unit for power? Watts (W)
42 State the equation which links current, potential difference and power
P=IV
43 State the equation which links current, power and resistance
P=I2R
44 State the equation which links energy transferred, power and time
E=Pt
45State the equation which links charge flow, energy transferred and potential difference
E=QV
EQUATIONS TO LEARN!"#$% = '(%%$)* × !"*$)*,-. /,00$%$)1$!"#$% = '(%%$)*2 × 3$4,4*-)1$5)$%67 *%-)40$%$/ = !"#$% × *,8$5)$%67 *%-)40$%$/ = 'ℎ-%6$ 0."# × !"*$)*,-. /,00$%$)1$
Core Practical
GCSE SCIEN
CE: Physics 2. ElectricitySection 5: Mains Electricity
46
Current which regularly changes direction is
called…
alternating current
47An example of alternating current is…? mains electricity
48Current which flows in one direction is…? direct current
49An example of direct current is… batteries
50
What colour is the live wire in a three core
cable?
brown
51
What colour is the neutral wire in a three core
cable?
blue
52
What colour is the earth wire in a three core
cable?
green and yellow
53The brown wire in a plug is the _______ live
54The blue wire in a plug is the ________ neutral
55
The green and yellow wire in a plug is the
________
earth
56
The potential difference between the live
wire and others in the plug is _____ V
230V
57
Current flows into an appliance through the
_______ wire
live
58
Current flows out of an appliance through the
______ wire
neutral
59
The _________ wire is a safety feature of
appliances
earth
60
Potential difference between the neutral
wires and others in the plug should be ____ V
0V
61
What is the potential difference of mains
electricity in the UK?
230V
62
What is the frequency of the alternating
current in UK mains electricity?
50Hz
Section 6: The National Grid63
The national grid consists of…? Cables and transformers
64
Are power stations par of the national
grid?
no
65What does a step up transformer do? Increases p.d.
66What does a step down transformer do? reduces p.d. to 230 V
67
Why are transformers used? reduce current so that less heat is lost in cables,
increases efficiency
GCSE SCIEN
CE: Physics 2. ElectricityCore PracticalsSection 7: Static Electricity (Triple Only)
68 Why is static electricity called "static"? It is related to "static" (or still) electrons which build up on materials.
69 What type of charge do electrons have? Negative charge
70
How is static electricity produced? When certain insulating materials are rubbed against each other they become charged. Negatively charged electrons are rubbed off one material and on to the other. The material that gains electrons becomes negatively charged. The material that loses electrons is left with an equal positive charge.
71 What happens when electrically charged objects are brought close together?
When two electrically charged objects are brought close together they exert a force on each other.
72 What happens to two objects with the same type of charge?
They repel each other.
73 What happens to two objects with different types of charge?
They are attracted to each other.
74What is an electric field? A charged object creates an electric field around
itself, which is strongest close to the object. The further away from the charged object, the weaker the field.
75What happens if another charged object is placed in the field?
A second charged object placed in the field experiences a force. The force gets stronger as the distance between the objects decreases.
76
What does the electric field pattern look like for a positive charge near a negative charge?