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# E4 Introducing Electricity Part 1

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• Well..it's going to help for those student who have just started reading Electricity....especially for them who are more prone to watch and learn rather than listening lectures

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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
• ### E4 Introducing Electricity Part 1

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