Question

18. State the energy changes that occur in the
following:
(i) The unwinding of a watch spring.
(ii) Burning coal while operating a steam engine.
(iii) Lighting of a torch bulb.
(iv) An electric generator (or dynamo).​

Answer 1

Hey dude,

Here is your answer......

(i) Potential energy to kinetic energy.

(ii) Chemical energy of coal changes to heat energy of the steam. Heat energy changes into mechanical energy.

(iii) Chemical energy into light and heat energy.

(iv) Electrical energy change into mechanical energy.

Hope this will help you

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