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This video deals with efficiency. In the video, a quantity of water is boiled in an electric kettle (kettle) and the efficiency of the electric kettle is subsequently calculated and commented on. The video is intended for basic course students in the vocational entrance Electricity and IT, but everyone is of course welcome to watch. You may use this overview to navigate the video: 0:00 Title 0:03 Introduction 0:47 Preparation of the experiment 4:17 The experiment itself 7:33 Calculations 14:41 Conclusion and conclusion