P1 - Conservation And Dissipation Of Energy Flashcards
Chemical energy
Energy is transferred when chemical reactions take place, the energy stored in fuels
Electrical energy
Energy transferred by an electrical current
Elastic potential energy
Energy stored in a springy object
Elastic potential energy formula
½ x spring constant x extension²
½ x k x e²
K = spring constant (newtons per metre, N/m)
E = extension (metre, m)
Kinetic energy
The energy of a moving object
Kinetic energy formula
½ x mass x velocity²
½ x m x v²
Gravitational potential energy
The energy of an object due to its position
Gravitational potential energy formula
Mass x gravitational field strength x height
m x g x h
Conservation of energy
Energy cannot be created or destroyed, can only be changed from one form to another
Work done
How much energy is transferred
Work done formula
Force x distance
F x D
Power
Rate of doing work
Power formula
Energy / time
E / T
Wasted energy
Dissipated into surroundings in the form of heat
How can energy be transferred?
Mechanically - work is done by force
Electrically - work is done by moving charges
Heating - conduction and convection
