Objective 5:
1. Heat engines use thermal energy by expanding the gas. It causes the pistol to move down, so it lights the spark plug. They also turn it into mechanical energy.
2. Internal combustion engines are when the burning (combustion) of the fuel happens when the air gets into a combustion chamber. They use radiation for thermal energy. External combustion engines use the external heat to "energize" an internal fluid. These two are alike because they both use heat to run.
3. I think that modern cars use the internal combustion engines because these engines use a very common resource (air) to run, so it costs less money.
4. Unlike what we think, the refrigerator takes out all of the hot air, rather than putting cold air inside. This causes it to be cold.
5. A compressor in a refrigerator is the motor to the cooling system. This usually only runs when the thermostat of the refrigerator tells it to. If there was no compressor, all of the food would get hot because it wouldn't run when the thermostat told it to.
Cites:
http://www.ehow.com/how-does_4926292_car-engine-piston-work.html http://wiki.answers.com/Q/In_a_heat_engine_what_happens_to_thermal_energy_that_is_converted_from_chemical_energy
http://en.wikipedia.org/wiki/Heat_engine
http://www.alternatefuelsworld.com/heat-engines-part-3.html
http://en.wikipedia.org/wiki/Internal_combustion_engine
http://www.repairclinic.com/Refrigerator-How-Things-Work?red=#acompressor
No comments:
Post a Comment