Efficiency
Subject: Physics
Age range: 14-16
Resource type: Worksheet/Activity
An engaging lesson presentation (28 slides) and accompanying worksheet, which together look at how to calculate efficiency and explores how efficiency can be increased by reducing the ways that energy is transferred to less useful stores. The lesson begins by looking at the key term, dissipated, and ensuring that students understand that energy being dissipated to a thermal energy store is one of the main reasons why efficiency will be low. Moving forwards, students are introduced to the equation to calculate efficiency and shown how to leave the answer as a decimal or percentage. Mathematical skills are challenged when calculating the efficiency as a number of units have to be converted. The rest of the lesson looks at a range of methods that can be used to reduce losses. Students will work with the teacher to understand how lubrication works and then a homework task gets them to explore how insulation in homes reduces heat losses.
This lesson has been designed for GCSE students.
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