Natural Sciences Grade 7

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Presentation transcript:

Natural Sciences Grade 7 Term 3: Energy and Change Energy transfer to surroundings [part 1]

Topic 5 Energy transfer to surroundings Useful and wasted energy Natural Sciences - Grade 7

Useful and wasteful energy EXAMPLES Natural Sciences - Grade 7

Natural Sciences - Grade 7 Discuss slide 3 Identify the 4 pictures. Decide which pictures are examples of useful energy and give reasons. Name the examples of wasted energy and explain your reason[s]. Mention what you waste at school, at home, etc. Natural Sciences - Grade 7

Defining wasted energy Energy waste that is transferred in a system can easily escape to the surroundings as wasted energy. TYPE OF ENERGY EXAMPLE sound energy HAIR DRYER ELECTRIC DRILL FOOD PROCESSOR MOTOR BIKE heat energy CANDLE; LAMP, ENGINE Light energy Do you agree? Find relevant picture Natural Sciences - Grade 7

Defining useful energy Different appliances [radios, irons, kettles, etc.] represent energy systems that require input energy so that useful energy can be provided. APPLIANCES INPUT ENERGY OUTPUT ENERGY radio electrical energy sound energy electric iron heat energy cars chemical energy kinetic (mechanical) energy Natural Sciences - Grade 7

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