Energy Transfer and Efficiency in Grade 7 Natural Sciences
Explore energy transfer to surroundings, useful and wasted energy examples, and the concept of efficiency in energy systems. Identify examples of useful energy and reasons, as well as wasted energy sources. Understand the input and output energy of various appliances to grasp the importance of efficient energy use.
Download Presentation
Please find below an Image/Link to download the presentation.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. Download presentation by click this link. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.
E N D
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
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 sound energy EXAMPLE 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 electrical energy heat energy cars chemical energy kinetic (mechanical) energy Natural Sciences - Grade 7
