When you step on the accelerator of your car, the carburetor feeds more gasoline to the engine. The engine runs faster — that is, the chemical energy of the fuel is changed into heat energy and mechanical energy at an increased rate. But it is not enough to supply the engine with more gasoline; if that were all, your car would soon be on the scrap heap. A great many other factors are involved.
In order to burn the fuel, a greater supply of oxygen is needed; hence, the carburetor must suck in air to the engine in greater quantities than before. A good deal more heat is generated at high speeds. To keep the engine from becoming overheated, more cooling must be provided by the water pump, which circulates water through the engine jacket, and by the fan, which blows air over the radiator. The ignition must produce more sparks per minute to fire the fuel in the cylinders; more oil must flow in order to lubrícate the working parts. Many operations are required, therefore, in order to bring about an increased rate of energy transformation in your automobile.
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