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Match up the correct description of an efficient device and an inefficient device
What is the correct formula to calculate the correct efficiency of a device?
What is the correct formula for the percentage efficiency?
If a kettle has an efficiency of 0.9 and a total power input of 2000 W, work out the useful power output.
A kettle has a total energy input of 3,000 W and a useful energy output of 2,400 W. Calculate the percentage efficiency of the kettle