Energy Flashcards
Energy
The ability to do work. The unit for energy is joule (J)
Work
The transfer of energy from 1 form to another
Work (J) = Force (N) x Distance (m)
Forms of energy
Potential energy
Nuclear energy
Chemical energy
Kinetic energy
Thermal energy
Electric energy
Sound energy
Magnetic energy
Sound energy
Dissipation of energy
When energy is wasted/released
Sankey diagrams
An energy flow diagram that summarises all energy transfers
Useful energy = horizontal arrow
Dissipated energy = downward facing arrow
Energy efficiency formula
Useful energy transfer 100
% energy efficiency =______________________ x ____
Total input energy 1
Power
Work (Energy J)
Power =________________
Time taken
Unit of electricity
Kilowatt per hour (kWh)
