3.4 Domestic electricity slides

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Presentation transcript:

3.4 Domestic electricity slides D Wilson

Lesson 1 -Power

Starter Rank these in power used. Electric clock Cd player

Starter Answer Appliance Power rating (watts) Kettle 2000 Dishwasher 1500 Iron 1000 Washing machine 500 Blender 300 laptop 200 Cd player 30 Electric clock 1

Watts to kilowatts REMEMBER From watts to kilowatts you ÷ 1000 400wtts = 400/1000 kilowatts = 0.4kW From kilowatts to watts you x 1000 5kW = 5 X 1000 watts = 5000 watts

Power Energy transferred (j) = Power (W) x time (s) E = P x t Power = Energy transferred / time P = E / t Watts = joules / second

What uses the most energy in a week? Appliance Power rating (watts) Time used for over a week Kettle 2000 10 minutes Dishwasher 1500 60 minutes Iron 1000 300 seconds Washing machine 500 180 minutes Blender 300 100 seconds laptop 200 400 minutes Cd player 30 4 minutes Electric clock 1 24 hours each day

Lesson 1 – Reflection Convert them to kW Appliance Power rating (watts) (kW) kettle 2000 Washing machine 500 laptop 200 dishwasher 1500 Electric clock 1 Iron 1000 Cd player 30 Blender 300

Lesson 2- Using electrical energy

Lesson 2 – Using electrical energy

Electric bills

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