energy s6e6.a explain the role of the sun as the major source of energy and the sun’s relationship...
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Energy
S6E6.a Explain the role of the sun as the major source of energy and the sun’s relationship to wind and water energy.
S6E6.b Identify renewable and nonrenewable resources
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What is energy?
• Energy is the ability to do work.
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Why is energy important?
• We use energy to do everything we do. – Thinking– Playing – Working– Cooking– You name it!
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What is the ultimate source of all energy on Earth?
• The Sun!– The sun’s energy
powers all other energy sources.
– The sun’s energy powers wind and waves.
– Plants convert the sun’s energy into fuel we can use through photosynthesis.
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What are the two types of energy?
• Potential Energy– Stored energy
• Kinetic Energy– Energy of motion
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In what forms are potential energy and kinetic energy found?
• Heat or thermal energy
• Light (radiant)• Mechanical/kinetic • Electrical, • Chemical, • Nuclear energy
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How are these forms of energy stored?
• Renewable resources– an energy source that can be
replenished in a short period of time
• Nonrenewable resources– an energy source that we are
using up and cannot recreate in a short period of time
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Secondary Energy Sources
• An energy source (or carrier) derived from the conversion of other sources of energy, such as coal, nuclear, or solar energy. These are called primary sources.
• Electricity• Hydrogen
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How is energy used in homes?
• Most energy in homes is used for heating.
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What are the sources of renewable energy?
What are the pros (good things) about using these resources?
What are the cons (bad things) about using these resources?
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Solar EnergyEnergy from the Sun
• Solar energy is the sun’s rays (solar radiation) that reach the earth.
• Solar energy can be converted into other forms of energy, such as heat and electricity.
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Solar Energy• Solar energy can be converted to thermal
(or heat) energy and used to:
• Heat water – for use in homes, buildings, or swimming pools.
• Heat spaces – inside greenhouses, homes, and other buildings.
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Solar Power Advantages
• Solar energy is free• Its supplies are unlimited. • Using solar energy
produces no air, sound, or water pollution
• Low maintenance on equipment because no moving parts
• Photovoltaic cells can be used on a variety of products (The little panel on your calculator)
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Solar PowerDisadvantages
• The initial investment in equipment can be very expensive
• Solar power plants require a lot of room and can affect environment in areas where they exist
• Requires sunlight so it is not produced 24 hours a day
• Requires expensive batteries to store energy for use on cloudy days and at night