State the energy changes in the following while in use:
A steam engine.

State the energy changes in the following cases while in use : A ceiling fan

State the energy changes in the following while in use: Burning of a candle.

State the energy changes in the following cases while in use : An electric iron

State the energy changes in the following cases while in use: (a) loudspeaker (b) a steam engine (c ) microphone (d) washing machine (e) a glowing electric bulb (f) burning coal (g) a solar cell (h) bio-gas burner (i) an electric cell in a circuit (j) a petrol engine of a running car (k) an electric iron (l) a ceiling fan (m) an electromagnet

State the energy changes that occur in the Burning coal while operating a steam engine.

Explain the energy changes taking place in the following situations: (a) Switching on a flash light. (b) Using coal to generate electricity.

State the energy changes that occur in the lighting of a torch bulb.

State the energy changes that occur in the unwinding of a watch spring.

Which one of the following is used in genetic engineering ?

Predict the sign of entropy change for each of the following changes of state.