Question

Can u tell me how car engines make energy from heat

Answer 1

Yes. Fuel ignites inside the cylinder. The fuel explodes causing super-heated gas particles with large kinetic energy to impinge on the surface of the piston (the only moving part in the cylinder) and forces it down. The piston is connected via a rod to an off-set crankshaft, causing it to rotate and the energy is stored in the flywheel at the end of the crankshaft. From there the energy is transferred into the transmission eventually driving the wheels.

Answer 2

Sorry i am a class 8 student so please explain a bit

Answer 3

What is impinge

Answer 4

Connects with like when 'the boxer's fist impinged on his opponents chin'

Answer 5

and crankshaft

Answer 6

There are two essential components to the engine: a source of heat, and a very large source of cold, so to speak, or rather a place where heat can go and disappear. In the case of the car engine, the source of heat is the combustion (burning) of gasoline or diesel in air. The place where heat can disappear is the surrounding atmosphere. Both are necessary, and the general overall description of the process is that heat naturally flows from areas of high temperature (the burning gasoline) to areas of lower temperature (the surrounding air), and this flow of heat can be used to provide useful work (turning the wheels of the car), just like a paddle-wheel can harness the energy in a flowing stream of water.

In practice, here's how it works: you have a fat rod, called a piston, that fits into a cylinder. Gasoline vapor and air are injected into the cylinder and set on fire with a spark from the spark plug. The gasoline burns, heating up the air in the cylinder, and therefore increasing its pressure. (In chemistry class you'll learn that the pressure of a gas is proportional to its temperature.)

Since the pressure outside the piston is still just atmospheric pressure, the pressure inside is greater than the pressure outside, and the piston starts to slide out of the cylinder. But now a valve opens and lets all the hot gas inside the cyilnder out, into the atmosphere, where the heat dissipates (disappears without raising the temperature). Now the pressure inside the cylinder isn't higher than the pressure outside, and the piston can easily be pushed back into the cylinder, where we do the whole thing again.

The net result is that we burn gasoline and have a piston that slides back and forth in the cylinder. Some fancy linkages turn this back-and-forth motion into the revolving motion of the wheels.