Energy and Power

4. Like oil and coal, _______ gas is a byproduct of the natural decay process of plant and animal material over millions of years.
6. To measure the power of an engine, the unit of ______________ is used.
7. The chemical energy released from combustion forces the connecting rod down, creating ________ mechanical energy.
8. The correct order of a combustion cycle of four distinct strokes is: 1. Intake, 2.________, 3. Power, 4. Exhaust
11. One horsepower is the power required to move a 550-pound _____ 1 foot in 1 second.

1. Solar, nuclear, geothermal, wind-generated, and hydroelectric are all forms of ___________ energy.
2. In an internal-combustion engine there are two types of valves: ______________ and combustion..
3. For the engine to do its work, all of the systems within it must be _____________.
5. Thermal energy is caused by the _________ of atoms, and it must be transmitted from atom to atom.
9. The __________ is the snug-fitting engine part that moves up and down within the cylinder because of the pressure of combustion.
10. Early on, the three power sources that looked promising for the automobile were: ________, electricity, and internal combustion engine.