Physics 1A - Energy

Heat Radiation
1. Convection
  1. Involves Particles
  2. Mainly Liquids and Gasses
  3. Hotter Particles lose Density and start to rise, taking their heat energy with them
2. Conduction
  1. Involves Particles
  2. Mainly Solids
  3. Collisions of particles
3. Radiation
  1. Uses InfraRed Radiation
  2. Can be emitted by solids, liquids or gasses
  3. Emission of EM waves
  4. Matt Black = Absorb
  5. Shiny White = Reflect
Condensation + Evaporation
1. Condensation = Gas →Liquid
  1. Evaporation's the opposite
2. Factors increasing Rate of Evaporation
  1. High Temp
  2. Low Density
  3. Large Surface Area
  4. More Airflow over liquid
3. Factors increasing Rate of Condensation
  1. Low Temp (of Gas)
  2. Low Temp (of Surface)
  3. High Density
  4. Less Airflow
Specific Heat Capacity
1. How much energy stuff can store
2. E = M x C x θ
3. Energy Transferred (J) = Mass (kg) x SHC (j/kg) x Temp Change (°C)
Energy Transfer
1. Electric
2. Light
3. Sound
4. Kinetic
5. Nuclear
6. Thermal
7. Gravitational Potential
8. Elastic Potential
9. Chemical
10. GP, EP & Chemical Energy are stored energy waiting to be transferred into another type
11. Energy can't be created or destroyed
Efficiency
1. Efficiency = Useful Power Out ÷ Total Power In
  1. For Energy, Just replace 'Power' with energy
2. Efficiency can be given as a decimal or percentage
Cost of Energy
1. Energy = Power x Time
  1. Units = kW x Hours
    1. Units = kWh
2. Cost = Energy x Price p/ Unit
3. Energy = No. of Units

Resource summary

	Created by Zaki Rizvi over 9 years ago