APES Flashcards
Nonrenewable Energt
fossil fuels (coal, oil, natural gas) and nuclear fuels.
Commercial energy sources-
those that are bought and sold, such as coal, oil and natural gas.
Subsistence energy sources
those gathered by individuals for their own use such as wood, charcoal and animal waste.
We produce 70% of what we use and import the rest (most is oil
True
Using fossil fuels directly
Oil, Gas
Using fossil fuels indirectly
Electricity
What do rural or developing nations use?
wood, charcoal, and animal waste
To determine the best fuel source certain factors must be considered (First 3)
Purpose for which it is needed
The cost of obtaining the fuel
The cost of converting the fuel into work
To determine the best fuel source certain factors must be considered (Last 2)
Energy loss during extraction, processing, and transport
Waste production and pollution
1st Law of thermodynamics
energy can neither be created nor destroyed, only altered in form
2nd law of thermodynamics
as energy is transferred or transformed, more and more of it is wasted
Most coal burning power plants are about _____ percent efficient
35
Cogeneration
using a fuel to generate electricity and to produce heat
Cogeneration
using a fuel to generate electricity and to produce heat
Most common example of cogeneration
If water is heated to create the steam to turn the turbine to generate electricity, the heat can also be used for industrial purposes or to heat buildings. Improves efficiency by 90 percent.
