1. Additional Physics – Forces L/O :- To understand mains electricity Electricity in your home Exam Date -

2. Quick quiz What is the equation for work done? How does current behave in a parallel circuit? What is an LDR and how does light intensity affect the resistance? What is charge measured in? How can you work out resistance? What affects the resistance in a circuit? How does voltage behave in a parallel circuit? How can you work out power and what is it measured in? How does current behave in a series circuit? What is the equation for working out current? How does voltage behave in a series circuit?

3. http://www.youtube.com/watch?v=SL6 C8Yz_bgs

4. a)What is the difference between A.C. and D.C. current? b)Where would you find A.C. current? c)Where would you find D.C. current? d)What is the frequency of mains electricity? e)What is the voltage of mains electricity? Watch the demo from your teacher and then answer these questions

5. 10/10/2015 Wiring a plug Earth wire Neutral wire Insulation Live wire Fuse 1. 2. 3. 4. 5. 6. Cable grip The live wire of a plug alternates between positive and negative potential relative to the Earth The neutral wire of a plug stays at a potential close to zero relative to the Earth

6. 10/10/2015 What is wrong with the wiring of these plugs?

7. 10/10/2015 What is wrong with the wiring of these plugs?

8. 10/10/2015 What is wrong with the wiring of these plugs?

9. 10/10/2015 What is wrong with the wiring of these plugs?

10. 10/10/2015 Earth wires Earth wires are always used if an appliance has a _____ case. If there is a _____ in the appliance, causing the live wire to ______ the case, the current “_______” down the earth wire and the ______ blows. Words – fuse, fault, metal, surges, touch Metal Fault Touchsurges Fuse The earth wire allows the electricity a quick path to the ground

11. What have you learnt? Do you know what the frequency of mains electricity is? Do you know what the voltage of mains electricity is? Could you label a plug? Can you recognise when a plug is incorrectly wired?