P3 Energy Flashcards
Energy stores
Gravitational potential energy Chemical Nuclear Elastic potential energy Kinetic Thermal
Energy transfers
Heat Sound Light Electric Work done
Efficiency formula
Efficiency = useful energy out/total energy in
Principal of energy conservation
Energy cannot be made or destroyed only stored or transfered
How to represent energy transfer
Sanely diagrams
3 ways of heat transfer
Conduction
Convection
Radiation
How to stop conduction
Use pockets of gas or rubber connections between materials because rubber is a bad conductor
How to stop convection
Use a vacuumed
How to stop radiation of heat
Use reflective surfaces to reflect heat back
An objects gravitational potential energy depends on(3 factors)
Mass
Gravitational field strength
Height(distance from gravity source
An objects kinetic energy depends on(2 factors)
Mass
Velocity
Earths gravitational field strength
9.81N(10N)
Kinetic energy =
1/2 * mass* (velocity)^2
KE = 1/2m(v)^2
Gravitational potential energy =
Mass * gravitational filed stregnth * height
GPE = mgh
Renewable energy
Wind(kinetic) Solar(thermal) Tidal+wave(kinetic) Hydroelectric(kinetic) Biomass(chemical) Geothermal(thermal)
