E4   Introducing Electricity Part 1
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  • Mains electricity Supply a lot of electrical energy Can give us an electric shock Appliances, usually portable Generated in power stations Electric cells Supply only a small amount of energy Safe to touch Appliances need to be plugged into a mains socket Generated from chemicals in the cells

Transcript

  • 1.
    • Watch this video first.
  • 2. Introducing Electricity – Part 1
  • 3.
    • To draw and interpret circuit diagrams with a variety of electrical components
    Learning outcomes: You will learn:
  • 4.
    • 2 main sources:
      • Mains electricity
      • Electric cells
        • - 2 or more cells make up a ‘battery’
    Sources of electricity
  • 5. Cross section of a torch switch
  • 6.
    • Form a circuit for electricity to flow through
    Examples of electrical components
    • Cells (Batteries)
    • Bulb
    • Switch
    • Copper strips (Wires)
  • 7.  
  • 8. What is a circuit?
    • A circuit is the pathway through which current travels.
  • 9. Spot the differences A B
  • 10. Open circuit
    • When the switch is “off”, the circuit is open .
    • Current cannot flow through it. The bulb will not be lit.
  • 11. Open Circuit
  • 12. Closed circuit
    • When the switch is “on”, the circuit is closed .
    • Current can flow through it. The bulb will be lit.
  • 13.  
  • 14.
    • A source of electrical energy
    • A closed circuit
    Conditions for the flow of an electric current
  • 15.
    • Analysing
    • Look at the four circuits below.
    • In which circuit does the bulb light up?
    • Circuit D
  • 16.
    • An easy way to represent the electrical components in a circuit
    • Symbols are used to represent the various components
    Circuit Diagram
  • 17.
    • Analysing, explaining
    • Here are two circuit diagrams with 2 light bulbs.
    • Which circuit, A or B, is the same as Circuit 2 seen in the previous slide? Explain.
  • 18. Analysing, explaining Circuit diagram A is the same as for Circuit 1 in Fig. E4.6. (The extra line between the two cells is unnecessary but not wrong). Circuit B is different as the light bulb is situated between the two cells.
  • 19. Symbols of some electrical components
  • 20.  
  • 21. Visit the following website to build electric circuits and draw diagrams:
    • www.bbc.co.uk/schools/scienceclips/ages/10_11/changing_circuits.shtml
  • 22. What have we learnt today
    • 1. An electrical circuit is the path along which electrical charges move .
    • 2. Batteries, bulbs, wires and switches are some electrical components that make up a circuit.
    • 3. An open circuit cannot allow current to follow through it. A closed circuit allows current to flow through it.
    • 4. You have learnt some symbols of the common electrical components that make up a circuit.