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GCSE Physics double award notes

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- 1. Electricity at Home GCSE Physics pg 134
- 2. Aims of the lesson • Recall how to construct a circuit with multiple switches controlling an electrical device
- 3. Leads Two-way switch Battery Bulb
- 4. Draw the circuit into your note book-
- 5. Aims of the lesson • Understand how a financial bill for electrical energy is calculated for a home • State the unit for domestic electrical energy • Solve simple problems related to domestic electricity
- 6. Paying for Electricity • Under the stairs you will find… The Electric Meter kWh = kiloWatt Hour 29581 Units used
- 7. Paying for Electricity At my house 29 851 kiloWatt hour units of electricity have been used 1 kWh 1 000 3 600 seconds Joule per second 1 kWh = 3 600 000 Joules 29 851 kWh = 107 463 600 000 Joules
- 8. Paying for Electricity (pg 140) • The electrical energy we use at home is measured in kiloWatt hours (kWh) • If ten 100 W light bulbs are on for one hour then 1 kWh of energy will be transferred • 1 kWh is referred to as ‘one unit of domestic energy’ What do you get if you sit under a cow? A pat on the head…
- 9. Finding out how much you owe… 10 / 7 / 2009 25 / 8 / 2009 2 0 5 4 8 5 4 9 6 8 40 Watts 40 Watts 120 Watts On for 2 ½ hours
- 10. Electrical Units The number of electrical units used is calculated by- The present meter reading minus previous meter reading Or… The power rating of an appliance (in kW) multiplied by the time it is on (in hours)
- 11. Paying for Electricity The price of the electricity is then worked out using- Total cost = Number of units used x Cost per Unit Pg 142- Questions 41, 42 and 43 Set by the Government
- 12. Cost of Electricity • When paying for electricity one unit is the same as 1000 Watts of energy being used in one hour. • If a 60 W bulb is on for 4 hours then this is the equivalent of 60 / 1000 x 4 = 0.24 units = 0.24 kWh
- 13. Aims of the lesson • Recall some of the safety features of electricity in the home • Recognise the three-pin plug • State the function of a fuse • Recall how to select a fuse for an electrical appliance
- 14. Pg 138- Wiring a Three Pin Plug Live Earth Neutral Connecting block Earth Live Wire Wire Fuse Neutral Wire Fuse holder Screw Cable Grip Insulation
- 15. Electrical Safety • It’s not big and it’s not clever… based on actual events…
- 16. It’s for your own protection… • The Fuse Page 138 A fuse that ‘blows’ has broken the circuit because too much current has over-heated and melted the tiny wire within the fuse.
- 17. Which Fuse to Use? • Selecting the correct fuse Page 139 The Power Rating and Voltage of a device will always be stated. Usually the voltage is 230 V. e.g. For an electrical jigsaw with a power rating of 460 W P=IxV 460 = I x 230 I = 460 / 230 I=2A Use a fuse just above 2 A, possibly P I V to the rescue! a 3 A fuse
- 18. Question Time • Page 142 Attempt questions 39 and 40
- 19. Aims of the lesson • Recall some of the safety features of electricity in the home • State the difference between AC and DC electricity
- 20. An electrical fault (1)
- 21. An electrical fault (2)
- 22. Earth wire
- 23. Electricity at Home http://www.absorblearning.com/media/item.action?quick=73#
- 24. Electricity at Home
- 25. Direct current (d.c.)
- 26. Alternating current (a.c.)

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