Power and electrical power

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Power and electrical power 21st October Power and electrical power Objectives Understand what power is. Explain that the amount of electrical energy a device transforms depends on how long the appliance is switched on for and the rate at which the device transforms energy. Be able to calculate the cost of electrical energy used. Keywords: Efficiency, Power, Energy, Kilowatt, Kilowatt-hour 2 lessons

Power What is power? Power is the energy transferred in a certain time. Power in Watts is the amount of Joules transferred in 1 second. ENERGY POWER ¦ TIME

Power Demo Height x weight = energy Energy/time = power Total height: Time for walk: Time for run: Energy for walk: Energy for run: Power walk: Power run:

Electrical Power In pairs: Do questions from Milner Text book p 40-41 including the remember box. Time limit: 15 minutes Peer mark.

Plenary – Stand Up, Sit Down Watts Joules 1Joule/second Energy = Power x Time 400 Joules 2400 Joules (2.4kJ) What is power of a device measured in? What is energy normally measured in? Define a Watt. How can you calculate Energy? A light bulb is marked "40W". How much energy will it get through in 10 seconds? How much energy will the same light bulb get through in a minute?