Showing posts with label Power. Show all posts
Showing posts with label Power. Show all posts

Saturday, October 31, 2015

4.16 Describe the energy transfers involved in generating electricity using several different methods

Solar (panels)
Light energy from the sun (Don't say solar energy!! There is no such thing as solar energy!) is transferred by the solar cells into electrical energy (though in some water heating systems, the solar energy is used to heat water, which means light to thermal energy)

Hydro
Kinetic energy of the water spins a turbine, which is connected to a generator. This generator transfers the kinetic energy into electrical energy

Wind
Kinetic energy from the wind turns the blades, which are connected to a turbine. The turbine spins, which is connected to a generator. This generator takes the kinetic energy and transfers it into electrical energy :)

Geothermal
The thermal energy from the ground is used to heat water, which turns to steam and is pressed through narrow pipes: the thermal energy has been converted to kinetic energy, which is used to spin a turbine, which spins a generator which turns this kinetic energy into electrical energy.

Nuclear
Nuclear energy is transferred to heat energy as it is used to heat up the water. This heat is then transferred to kinetic energy, which spins a turbine connected to a generator. The generator transfers the kinetic energy from the turbine into electrical energy.

Fossil fuels 
(coal, oil, natural gas, etc.)
The chemical energy in the fossil fuel (i.e. coal) is transferred into heat energy as it causes the water to evaporate as it is heated. The steam travels through narrow tubes - the heat energy was transferred to kinetic energy. This steam makes the turbine spin, which is connected to a generator and its (kinetic) energy transferred to electrical energy.

Figure 1: Parts of a nuclear power station



Friday, October 30, 2015

4.17 Describe the advantages and disadvantages of methods of large scale electricity production from various renewable and nonrenewable resources.

Figure 1: A table that I made. Note that "P.S." stands for power station :)

If you have access, make the right choice. Opt for a renewable source of energy. Try using biofuel instead of natural gas and heat your water with a solar panel ^_^ The earth says thank you.

This is a really good website if you want some more in-depth stuff (click below)



4.14 Describe power as the rate of transfer of energy or the rate of doing work

Power is the rate of energy transferred; the rate at which work is done. It is essentially how quickly these processes happen.