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?