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In this example, we go through how to calculate the useful effect when heating water. You can of course use the formula for useful effect in all cases where you know the useful energy and the energy supplied. You can download the tasks here: https://goo.gl/fwy6uy There is an answer in the tasks this time. Please write your opinion about it in the comments field. A big thank you for supporting the video to Jorck's Foundation, and Jens Christian Hansen, who has been a great help with professional inputs, as well as tasks! Music: Title: Silence for a Film, by: ann annie Retrieved via youtube audio library. Thank you!