Rubbing of hands together Kinetic energy into heat energy
Heat engine Heat energy into kinetic energy (mechanical)
Loudspeaker, Electric bell Electrical energy into sound energy
dynamo Kinetic energy into electrical energy
Electric motor Electrical energy into kinetic energy
Microphone Sound energy into electrical energy
Waterfall Potential energy into heat energy
Hydroelectric power generator Potential energy into electrical energy
Electric room heater, geyser, electric iron etc. Electrical  energy into heat energy
Electric bulb Electrical energy into light energy
Photoelectric emission Light energy into electrical energy
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