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TRANSCRIPT
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1How can a plastic ruler be given How can a plastic ruler be given an electric charge?an electric charge?
answer
•By rubbing it. •This causes charges to build up on the ruler.
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Electrons – tiny negative particles in an atom
answer
2 Name a particle Name a particle responsible for charge?responsible for charge?
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What happens to an What happens to an atom when it becomes atom when it becomes negatively charged? negatively charged?
It gains electrons
answer
3
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What happens to an What happens to an atom when it becomes atom when it becomes
positively charged? positively charged?
It loses electrons
answer
4
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What is build up of charge What is build up of charge on an object’s surface on an object’s surface
called? called?
Static electricity
answer
5
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What is moving What is moving charge called? charge called?
currentanswer
6
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Why are component Why are component symbols used in circuit symbols used in circuit
diagrams?diagrams?
Easier to draw and understand
answer
7
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Name the parts of the Name the parts of the atomatomanswer
8
Electron
Nucleus (protons and neutrons)
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Particle Name
Charge Location
Proton
Electron
Neutron
Complete the table?Complete the table?
Positive Nucleus
Negative Outside nucleus
Neutral Nucleus
answer
9
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Electrical Symbol
Name of electrical component10
answer
Cell
Battery
Ammeter
Variable resistor
Bulb
Lead
Voltmeter
Switch
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Label the positive and Label the positive and negative ends of the negative ends of the
cell.cell.
+ - answer
11
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Draw a series circuit Draw a series circuit diagram for a torchdiagram for a torch
answer
12
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Draw an arrow to show Draw an arrow to show the direction of the the direction of the
current for each cell.current for each cell.answer
13
A B
+ -
- +
Negative to positive
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answer14 Match the answer to the circuit.
Bright Off Dim Very Bright
Bright Very Bright (two cells)
Dull (two bulbs) Off (cells wrong way round)
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Amps (A)Ammeter
answer
15 What is the unit of electric current?
What is used to measure it?
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What happens to a wire What happens to a wire when a large current when a large current
flows though it?flows though it?
It heats up due to resistance
answer
16
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Volts (V)
Voltmeter
answer
17 What is the unit of voltage?What is used to measure it?
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Name an appliance Name an appliance that uses resistance that uses resistance
to produce heat.to produce heat.
Oven, kettle, straighteners etc...
answer
18
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Name an Name an appliance that appliance that uses variable uses variable resistance.resistance.
•Dimmer switch on a light
•Volume control
answer
19
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Name the safety Name the safety device inside a device inside a
plug. plug. How does it work?How does it work?
FuseIt melts when too large a current flows
answer
20
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Label the plugLabel the plug
answer
21
Earth
NeutralLive
fuse
cable
Cable grip
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What is VOLTAGE?What is VOLTAGE?
The energy supplied by the cell
to the charges in the circuit
answer
22
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Where should the Where should the ammeter be ammeter be
placed?placed?answer
23
A In series
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Where should the Where should the voltmeter be placed?voltmeter be placed?
answer
24
V
Across the component
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What is the voltage What is the voltage across the bulbs?across the bulbs?
answer
25
Series CircuitVoltage of cell =
Voltage of all components added together
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What is the voltage What is the voltage across the bulbs?across the bulbs? answer
26
Parallel CircuitVoltage of cell =
Voltage of each component
V
V
3VV
3V
3V
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What is the current What is the current measured at each measured at each
ammeter?ammeter?
27
Parallel CircuitCurrent at cell =
Current of each branch added together
2A
2A
1A
1A
A
A
A
A answer
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What is the current at What is the current at each bulb?each bulb?
answer
28
2.5ACurrent has the same value at all points in a series circuit.