The conversion of fuel energy into power in , An engine starts when petrol is mixed with air in a device called a carburetor. To form a highly combustible mixture. The mixture is drawn into the cylinders through valves, Compressed to about an eighth or ninth of its original volume by a piston, And then ignited by a spark plug. Rapid expansion of the burning gas, the combustion, Drives the piston down the cylinder. The downward thrust is changed by the connecting rod too, Rotary movement of the crankshaft in much the same way as a, Cyclist pressing his foot on the pedal turns the chain wheel. The downward stroke of the piston is known as the power stroke in … Continue reading The engine – how power is created