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3. 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.

4. Electrons – tiny negative particles in an atom answer 2 Name a particle responsible for charge?

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

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

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

8. What is moving charge called? current answer 6

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

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

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

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

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

14. Draw a series circuit diagram for a torch answer 12

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

16. 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)

17. Amps (A) Ammeter answer 15 What is the unit of electric current? What is used to measure it?

18. What happens to a wire when a large current flows though it? It heats up due to resistance answer 16

19. Volts (V) Voltmeter answer 17 What is the unit of voltage? What is used to measure it?

20. Name an appliance that uses resistance to produce heat. Oven, kettle, straighteners etc... answer 18

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

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

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

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

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

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

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

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

29. 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

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