P1: Conservation/dissipation of energy Flashcards
What are the energy stores
Kinetic
Grav Potential
Elastic
Chemical
Electrostatic
Magnetic
Light
Internal
What are the energy transfers
Radiation
Thermal
Electrical
Mechanical
What is the Conservation of Energy
Energy cannot be created or destroyed, we can only transfer
What is the equation for kinetic energy
0.5 x Mass x Velocity squared
What is the equation for grav potential energy
mass x height x grav field strength
What is the equation for elastic energy
0.5 x Spring constant x Extension squared
What is energy measured in
Joules
What is the equation for thermal energy
Mass x Specific heat capacity x Temperature Change
What is efficiency
How good a device is at transferring energy input to useful energy output
How do we work out efficiency
Useful energy output/Total energy input
Multiply by 100 if you want a percentage
What is power
The rate of doing work
How do we work out power
Energy/Time
What is power measured in
Watts
What is time measured in
Seconds
What is mass measured in
Kilograms
