Energy

Forms of energy ,[object Object]

Some Energy Facts… ,[object Object],[object Object],[object Object]

Basically Energy… ,[object Object],[object Object],[object Object]

Top Ten Types of Energy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Energy Transfer ,[object Object]

Energy Transfer Input energy Kinetic Output (useful) energy- electrical/light The Dynamo Output (wasted) energy- heat/sound

The Unit of Energy ,[object Object],[object Object]

Conservation of Energy ,[object Object]

Conservation of Energy ,[object Object],[object Object],[object Object]

Example ,[object Object],Input Energy = Output Energy 200kJ = 80kJ + 120kJ Input energy Chemical 200 kJ Output (useful) energy- Kinetic 80 kJ Output (wasted) energy- heat/sound 120 kJ

Try this question- ,[object Object],[object Object]

Input energy Chemical 1 000 000 kJ Output (useful) energy- Electrical 400 000 kJ Output (wasted) energy- Heat/Sound 600 000 kJ Transforms to Kinetic The input energy has changed form to kinetic and then to both useful electrical energy and wasted energy. The input energy and output energy totals are equal as energy is conserved.

Energy Resources ,[object Object]

Tracing Back… the source of all energy ,[object Object],Nerve Cell Electrical Energy Loud Speaker Sound Energy Plug and wires Electrical Energy Power Station Kinetic Energy Fuel Chemical Energy Plants Chemical Energy

… the Primary Source The Sun Nuclear Energy

Types of Energy Resources ,[object Object]

Energy Resources ,[object Object],[object Object]

How is electricity generated? ,[object Object],[object Object]

Energy transfer in a Power Station ,[object Object]

Energy Resource Questions ,[object Object],[object Object],[object Object],[object Object]

Geothermal Energy The rocks not too far below the surface are quite hot, 500°C about 1 km down.

Geothermal Energy ,[object Object],[object Object]

Geothermal Energy - Deep drilling is very difficult - Drilling can also be expensive Disadvantages - Renewable energy resource - Huge quantities of energy available Advantages

Biomass harvesting switchgrass

Biomass ,[object Object],[object Object],[object Object],http://www.energyquest.ca.gov/story/chapter10_flash/index.html

Biomass ,[object Object],[object Object],[object Object],Disadvantages ,[object Object],[object Object],[object Object],Advantages

Crossword Puzzle ,[object Object]

Efficiency ,[object Object],[object Object]

Efficiency is a measure of how good a device is at changing energy from one form to another. All devices waste energy, so the efficiency of a device is never 100%. There is a formula that allows you to calculate the efficiency of a device or of a process. Energy efficient light bulbs are more efficient than normal light bulbs because they w____ less energy, and more of the e______ energy that they are supplied with is converted into l___ energy and not h___. aste lectrical ight eat

The efficiency formula We can express efficiency mathematically using the equation: ,[object Object],[object Object],The efficiency formula is unusual because it has no units . It is a number between 0 and 1 or a percentage %. Useful energy measured in Joules (J) Total energy measured in Joules (J)

Efficiency for a bulb ,[object Object],[object Object],[object Object],[object Object],Efficiency = Useful Total = 45J/100J = 0.45 or 45% 55J heat

Energy

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Energy