
by Nikki
Alternate Energy is power, electric, energy dissipated in an electrical or electronic circuit or device per unit of time. The electrical energy supplied by a current to an appliance enables it to do work or provide some other form of energy such as light or heat. Electric power is usually measured in Watts, kilowatts (1,000 watts), and megawatts (1,000,000 watts). The amount of electrical energy used by an appliance is found by multiplying its consumed power by the length of time of operation. The units of electrical energy are usually watt-seconds (joules), watt-hours, or kilowatt-hours. For commercial purposes the kilowatt-hour is the unit of choice.
Scientists are always looking for alternatives to fossil fuels for our energy needs. Some alternatives have been found, but so far there is nothing as efficient and easy to use as fossil fuels.
Solar energy is energy produced by the sun. The
advantages of solar energy are that it is a
renewable resource, it is free and is nonpolluting.
However, there is no practical method of collecting
the sun’s energy.
Geothermal energy is energy produced from the heat
of the earth’s interior. Geothermal energy is also
free and nonpolluting. However, there are only
a few places where heat from the earth’s hot interior
comes close enough to the earth’s surface to be used
for energy.
Nuclear energy produces heat by splitting atoms.
However, this process produces radioactive waste.
Disposal of this radioactive waste is the major
problem with nuclear energy.
Wind and water can also be sources of energy. Wind
has been used for centuries to sail ships, pump water
and cut wood at sawmills. Falling water has also long
been used to spin turbines to produce energy.
Oil shale is a very fine-grained sedimentary rock that
contains enough organic matter to yield a significant
amount of oil. Although there is a large supply of oil
shale that could be recovered, it is more expensive to
produce than fossil fuels. Additionally, large amounts
of water are required to produce this fuel.
