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Term 3 Topic 5 Useful and wasted energy – Teachers for Tech and ScienceSkip to content
Find out if the learners know what the word waste means and ask them to give examples.
Ask them if machines can work without energy.
Show them examples of a few machines [e.g. sowing machine; over locker; etc.], electric appliances [e.g. kettle, hair clipper, fan, heater, etc.], tools [e.g. electric drill, hair curler, etc.]. If you do not have any, let the learners find pictures in magazines.
Teacher Input 1
Greet the learners
Present an overview of energy transfer by using Presentation 1: Energy transfer to surroundings [part 1].
Instruct the learners to discuss each slide in their groups or assign a slide[s] to each group.
Learner Activity 1
The learners discuss each slide.
Elaborate if necessary.
Learners can use the internet to gain more knowledge about wasteful energy.
Complete WORKSHEET A: Word search about wasted and useful energy.
Teacher to use WORKSHEET A: Memorandum to mark the learners’ work.
Teacher Input 2
Present an overview of energy transfer by using Presentation 2: Energy transfer to surroundings [part 2].
Hand out the Fact sheet: Useful and wasteful energy.
Inform the learners that they will have to read more about useful and wasteful energy.
Learner Activity 2
Learners read the Fact sheet about useful and wasted energy.
They must underline important facts.
Establish whether they paid attention and if they can remember what they had read.
Learners can complete WORKSHEET B: Insulation and energy saving [in class / as homework].
Teacher to use WORKSHEET B: Memorandum to mark the learners’ work.