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Electricity

Electricity. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. answer. How can a plastic ruler be given an electric charge?. 1. By rubbing it. This causes charges to build up on the ruler. answer.

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Electricity

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  1. Electricity 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

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

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

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

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

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

  7. answer What is moving charge called? 6 current

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

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

  10. answer Complete the table? 9 Positive Nucleus Negative Outside nucleus Neutral Nucleus

  11. answer 10 Cell Battery Ammeter Variable resistor Bulb Lead Voltmeter Switch

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

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

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

  15. 14 answer Match the answer to the circuit. Bright Off Dim Very Bright Bright Very Bright (two cells) Dull (two bulbs) Off (cells wrong way round)

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

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

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

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

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

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

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

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

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

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

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

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

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

  29. answer What is the current at each bulb? 28 Current has the same value at all points in a seriescircuit.

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