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Galvanic cell it converts chemical energy into mechanical energy

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Dynamo {mechanical to electrical}
motor {electrical to mechanical}
light bulb {electrical to light(and heat)}
solar panels/pvc {light to electrical}
speakers {electrical to sound(basically mechanical)}
heaters {electrical to heat}
mobile phones {electrical to light, sound(mechanical) and heat}
car engine {chemical to mechanical)
green plants {light to chemical}
spring{mechanical(kinetic) to mechanical(potential) AND vice versa}

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added few.mostly, others would be derivatives of these. for example, you can change motor into washing machines or fans. or write dynamos as windmills or hydro-electric power stations
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