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The principle of conversation of energy

The principle of conversation of energy:

Energy is the capacity, or ability, to do work. The unit of energy is the joule.
1) Mechanical energy is converted to electrical energy by a generator
(ii) Electrical energy is converted to  mechanicalenergy by a motor
(iii) Heat energy is converted to mechanical energy by a steam engine
(iv) Mechanical energy is converted to heat energy by friction
(v) Heat energy is converted to electrical energy by a solar cell
(vi) Electrical energy is converted to heat energy by an electric fire
(vii) Heat energy is converted to chemical energy by living plants
(viii) Chemical energy is converted to heat energy by burning fuels
(ix) Heat energy is converted to electrical energy by a thermocouple
(x) Chemical energy is converted to electrical energy by batteries
(xi) Electrical energy is converted to light energy by a light bulb
(xii) Sound energy is converted to electrical energy by a microphone
(xiii) Electrical energy is converted to chemical energy by electrolysis.

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