Energy and Society

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Energy and Society by Mind Map: Energy and Society

1. HEAT?

1.1. Heat is transferred until equilibrium is reached

1.2. Is the transfer of energy from a hot object to a colder object

1.3. 3 Methods - Radiation - Conduction - Convection

1.4. Q=mc x T

1.5. J/kg.C

1.6. Qlost=-Qgained

2. E associated with Motion

2.1. Electrical E

2.2. Thermal E

2.3. Radiant E

2.3.1. From the sun

2.4. Kinetic E

2.4.1. Energy in moving objects

2.4.2. Ek=1/2 x m x V^2

2.5. Sound E

3. Mechanical energy

3.1. Ability to do work

3.2. Total Energy = Et=Ek+Eg

3.3. (Initial)Ek+Eg=(Final)Ek+Eg

3.4. A 3.0 kg stone is thrown at 10 m/s [down] from a 15m high building. What is the velocity of the stone when it is 2.0 m above the ground?

3.5. Answer: (9.8)x15+ 0.5x10^2 = 9.8x2 + .5xv^2 = 19m/s (down)

4. % Efficiency

4.1. =(Eout / Ein) x100

5. Power

5.1. Rate at which a certain amount of work is done

5.2. Measured in Watts W, (J/t)

5.3. 1 HP = 750 Watts

6. Thermal energy

6.1. Is the total energy of all the molecules

6.2. Temperature: - measure of average kinetic energy of particles expressed in units or degrees

6.3. Absolute Zero: (-273.15 C) by William Thomson undergo: - superconductivity - superfluidity

7. Thermal Energy Methods

7.1. Conduction

7.1.1. Transfer of heat between substances that are in direct contact with each other. The better the conducter, the more rapidly heat will transfer

7.2. Convection

7.2.1. Up and down movement of gases and liquids caused by heat transfer

7.3. Radiation

7.3.1. Electromagnetic waves travelling through space

8. Potential Energy

8.1. Gravitational PE

8.1.1. Depends on height for E

8.1.2. Eg=m x g x h

8.2. Chemical PE

8.2.1. Stored in fuel, food, batteries, etc.

8.3. Elastic

8.3.1. Stored in stretched or squashed objects

8.4. Nuclear

8.4.1. E stored in nuclei

8.5. Magnetic

8.5.1. E in magnets and electromagnets

9. Work

9.1. Use of force to move object a certain distance

9.2. Applied force is same motion as displacement

9.3. Work = Force x Distance

9.4. Work = Nm = J

10. Latent Heat

10.1. Q=mL

10.2. Q=Heat change J m=mass Kg L=Specific latent heat J Kg-1


11.1. Raw material obtained from nature to be used for wok

11.2. Non Renewable

11.2.1. Uranium U235 to fuel pelletes Neutron is put close to the fuel and nuclear fission occurs Uranium breaks apart and releases energy the steam then turns turbines to make electricitiy

11.2.2. Althabasca Tar Sands takes 50% of energy to mine tar below surface Only 10% of Bitumen can be mined on surface

11.2.3. Fossil Fuels composed of hydrocarbons burnt to produce steam to spin turbines to create electricity

11.3. Renewable

11.3.1. Solar Passive solar heating designing building or structure to take advantage of the sun's energy at all times of the year Active solar heating Absorbs sun's energy and converts it to electricity

11.3.2. Wind Kinetic energy from wind turns turbines to produce Electricity

11.3.3. Tidal gravitational force of moon and sun cause tidal waves that move turbines to produce electricity affects ecosystem, doesnt produce electricity all the time

11.3.4. Biomass Chemical Potential Energy stored in plans and animals Burn trash to produce heat fermentation to produce methane and ethane

11.3.5. Geothermal Thermal energy taken from beneath earth's surface

11.3.6. Nuclear Fusion Nuclei of atoms of light elements join together at extremely high temperature

11.3.7. Fuel Cell Hydrogen combines with O2 with a catalyst creating electricity and water