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Renewable sources of energy
The sun constantly gives off energy in the form of light and heat.
Earth receives enough solar energy to meet the energy needs of the entire world for 40 years.
Advantages:1. It does not cause pollution2. Abundant availability, It will not.Disadvantages:3. Its only available when the sun is out and it is
very spread out.
Solar Energy
Solar Plants: Rows of giant mirrors focus the sun’s rays to heat a tank of water. The water boils, making steam that is used to generate electricity.
Solar Cells: consists of a “sandwich” of very thin layers of the element silicon and other materials.
Solar Technologies
Exploring a Solar House
Passive: converts sunlight into thermal energy without using pumps of fans.
Active: captures the sun’s energy, then uses fans and pumps to distribute the heat.
Solar Heating Systems
Wind energy is an indirect form of solar energy.
The differences in pressure cause winds as air moves from one area to another.
Wind can be used to turn a turbine and generate electricity.
Wind
WIND POWER
Hydroelectric power is electricity produced by flowing water.
It is the most widely used source of renewable energy in the world today.
Advantages:1. It is inexpensive.2. No pollutions3. Provides a steady supply of
energy.
Hydroelectric power
Tides are another source of moving water.
The gravity of the moon and sun causes the water on Earth’s surface to rise and fall on its shores.
A few tidal power plants have been built to take advantage of this regular motion.
Tidal Energy
The oldest fuel used for heat and light is wood.
Other biomass fuels are leaves, food, wastes and manure.
Biomass materials can be converted into other fuels;
1. Gasohol-corn makes alcohol, add alcohol to gasoline produces fuel for cars.
2. Bacteria decomposes turns into methane gas is used to heat buildings.
Biomass Fuels
BIOMASS ENERGY
Intense heat from Earth’s interior. Geothermal energy is an unlimited source
of cheap energy. Disadvantages:1. Only a few places where magma comes
close to Earths surface. (Iceland)2. Need to drill deeper wells (expensive)
Geothermal energy
Energy of the future:1. Burns cleanly2. Water is its only by-product3. It creates no smog, smoke or acid rain.4. Can be handled and transported
through pipelines.5. Exists on Earth in large supply.Disadvantage:Almost all of Hydrogen is combined to
Oxygen
Hydrogen Power
Hydrogen Power