Revise energy transfers and use sankey diagrams to calculate the efficiency of these conversions with bbc bitesize gcse physics. Energy efficiency measures the proportion of energy which is wasted.
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Since power is just energy per second we can also calculate it from.
Efficiency formula physics bbc bitesize. Efficiency is a measure of how well something does its job. The 9 1 aqa specification for gcse physics examined from summer 2018. We calculate it using the formula.
Read about our approach to external linking. Gcse physics revision science section covering efficiency and the equation for power and efficiency. The efficiency of a device is the proportion of the energy supplied that is transferred in useful ways.
All the answers to the front page can be found there. Physics is the study of energy forces mechanics waves and the structure of atoms and. The bbc is not responsible for the content of external sites.
Using efficient electrical devices saves money and energy. Efficiency frac useful. All worksheets are based on bbc bitesize pages with the same name with a qr code to guide students to the correct page.
Learn about and revise the rate of energy transfer and calculating power and efficiency with gcse bitesize physics. The rate at which energy is wasted needs to be reduced and there are a number of ways to save energy especially thermal energy. As power is equal to useful energy transferred per second another way to calculate efficiency is to use the formula.
The efficiency can be calculated as a decimal or a percentage. There is then a 15 mark exam style question to test their new knowledge. This is a worksheet in a series made to summarise and recap topics from gcse physics.
Useful energy total energy e g. 40 50 0 80 efficiency is normally given as a percentage so 0 80 would be 80.
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