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Published byHester Small Modified over 3 years ago

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1 How can a plastic ruler be given an electric charge? answer By rubbing it. This causes charges to build up on the ruler. 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 responsible for charge?

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What happens to an atom when it becomes negatively charged? It gains electrons answer 3

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What happens to an atom when it becomes positively charged? It loses electrons answer 4

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What is build up of charge on an object’s surface called? Static electricity answer 5

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What is moving charge called? current answer 6

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Why are component symbols used in circuit diagrams? Easier to draw and understand answer 7

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Name the parts of the atom answer 8 Electron Nucleus (protons and neutrons)

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Particle NameChargeLocation Proton Electron Neutron Complete the table? Positive Nucleus Negative Outside nucleus Neutral Nucleus answer 9

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Electrical SymbolName of electrical component 10 answer Cell Battery Ammeter Variable resistor Bulb Lead Voltmeter Switch

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Label the positive and negative ends of the cell. + - answer 11

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Draw a series circuit diagram for a torch answer 12

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Draw an arrow to show the direction of the current for each cell. answer 13 AB + - - + Negative to positive

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answer 14 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 when a large current 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 that uses resistance to produce heat. Oven, kettle, straighteners etc... answer 18

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Name an appliance that uses variable resistance. Dimmer switch on a light Volume control answer 19

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Name the safety device inside a plug. How does it work? Fuse It melts when too large a current flows answer 20

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Label the plug answer 21 Earth Neutral Live fuse cable Cable grip

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What is VOLTAGE? The energy supplied by the cell to the charges in the circuit answer 22

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Where should the ammeter be placed? answer 23 A In series

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Where should the voltmeter be placed? answer 24 V Across the component

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What is the voltage across the bulbs? answer 25 Series Circuit Voltage of cell = Voltage of all components added together

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What is the voltage across the bulbs? answer 26 Parallel Circuit Voltage of cell = Voltage of each component V V 3V V

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What is the current measured at each ammeter? 27 Parallel Circuit Current at cell = Current of each branch added together 2A 1A A A A A answer

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What is the current at each bulb? answer 28 2.5A Current has the same value at all points in a series circuit.

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