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    				| 1. | 
                                    State the energy changes in the following while in use :(i) Burning of a candle. (ii) A steam engine. | 
                            
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Answer»  Energy changes : (i) Burning of a candle: Chemical energy to light energy. (ii) Steam engine: Chemical energy of coal first changes to heat energy of steam and then heat energy charges into mechanical energy.  | 
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