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. Potential Energy

2.1. Gravitational PE

2.1.1. Depends on height for E

2.1.2. Eg=m x g x h

2.2. Chemical PE

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

2.3. Elastic

2.3.1. Stored in stretched or squashed objects

2.4. Nuclear

2.4.1. E stored in nuclei

2.5. Magnetic

2.5.1. E in magnets and electromagnets

3. Work

3.1. Use of force to move object a certain distance

3.2. Applied force is same motion as displacement

3.3. Work = Force x Distance

3.4. Work = Nm = J

4. E associated with Motion

4.1. Electrical E

4.2. Thermal E

4.3. Radiant E

4.3.1. From the sun

4.4. Kinetic E

4.4.1. Energy in moving objects

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

4.5. Sound E

5. Mechanical energy

5.1. Ability to do work

5.2. Total Energy = Et=Ek+Eg

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

5.4. 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?

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

6. % Efficiency

6.1. =(Eout / Ein) x100

7. Power

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

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

7.3. 1 HP = 750 Watts

8. Thermal energy

8.1. Is the total energy of all the molecules

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

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

9. Thermal Energy Methods

9.1. Conduction

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

9.2. Convection

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

9.3. Radiation

9.3.1. Electromagnetic waves travelling through space

10. Latent Heat

10.1. Q=mL

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

11. ENERGY RESOURCES

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

11.2. Non Renewable

11.2.1. Uranium

11.2.1.1. U235 to fuel pelletes

11.2.1.2. Neutron is put close to the fuel and nuclear fission occurs

11.2.1.3. Uranium breaks apart and releases energy

11.2.1.4. the steam then turns turbines to make electricitiy

11.2.2. Althabasca Tar Sands

11.2.2.1. takes 50% of energy to mine tar below surface

11.2.2.2. Only 10% of Bitumen can be mined on surface

11.2.3. Fossil Fuels

11.2.3.1. composed of hydrocarbons

11.2.3.2. burnt to produce steam to spin turbines to create electricity

11.3. Renewable

11.3.1. Solar

11.3.1.1. Passive solar heating

11.3.1.1.1. designing building or structure to take advantage of the sun's energy at all times of the year

11.3.1.2. Active solar heating

11.3.1.2.1. Absorbs sun's energy and converts it to electricity

11.3.2. Wind

11.3.2.1. Kinetic energy from wind turns turbines to produce Electricity

11.3.3. Tidal

11.3.3.1. gravitational force of moon and sun

11.3.3.2. cause tidal waves that move turbines to produce electricity

11.3.3.3. affects ecosystem, doesnt produce electricity all the time

11.3.4. Biomass

11.3.4.1. Chemical Potential Energy stored in plans and animals

11.3.4.2. Burn trash to produce heat

11.3.4.3. fermentation to produce methane and ethane

11.3.5. Geothermal

11.3.5.1. Thermal energy taken from beneath earth's surface

11.3.6. Nuclear Fusion

11.3.6.1. Nuclei of atoms of light elements join together at extremely high temperature

11.3.7. Fuel Cell

11.3.7.1. Hydrogen combines with O2 with a catalyst creating electricity and water