Diffrent types of energy

• The SI unit of energy is joules (J)
• radiaion


  the transfer of energy as electromagnetic waves
• coduction


  heat transfer, process of transferring heat or electricity through a substance.
• Convection


  The transfer of heat by the movement of a fluid
• Temperature


  A measure of how hot (or cold) something is; specifically, a measure of the average kinetic energy of the particles in an object.
• Thermal Heat Transfer

  The transfer or movement of thermal energy. Most common types of transfer Convection, Conduction, Radiation.100% efficiency is unattainable. ALL processes are irreversible
• 3 types of heat transfer

  radiation, conduction, convection
• efficiency = useful energy out J/ total energy in j x 100
• Kinetic Energy - the energy an object has due to its motion, measured in Joules.
• Potential Energy - the stored energy that an object possesses because of its position or shape, measured in Joules.
• There are 8 ways we can get energy, Hydro electric, Geo-thermal, bio-energy, tidal, fossil fuels, nuclear, solar and wind
• Renewable energy- energy that never runs out and when you use you automatically get more always full
• non-renewable energy: Energy that will run out unable to be created again after use eg fossil fuels
• Heat is a form of energy transfer and measured in degrees Joules
• temperature is a measure of average kinetic/thermal energy of the particles in a substance and is measured in .C
• The higher the thermal store of energy of an object, the higher its temperature will be and the faster its particles will be moving. Heat always flows from objects with a higher temperature
• Energy transfer in solid: via conduction
• Energy transfer through fluids: by convection
• Energy transfer through vacuum: by infa-red radiation
• A fluids is a liquid and gas
• a vacuum is a substance with no air particles
• Radiation is movement of heat in gases and through a vacuum ;it does not require particles to travel. THis heat radiation is infra red waves which are not visible to the human eye. The hotter the object the more infra red radiation is emmitted
• Direction of magnetic field is north/south
• convection is the movement of heat/particles through fluids( liquids and gases) As particles are heated they move upwards making this part less dense and causing it to rise. This sets up a convection current
• Independent variable: variable we change
• Dependant variable: Variable you measure
• Control variable: Always stays same
• Non metals are poor conductors of electricity because they dont have free electrons, And free electrons help the bigger particles vibrate and pass energy quicker
• Refraction: occurs when light travells at different speeds in different medians