Energy, work and power
by ENG PUAY XUN, RYMIRE S3-N3
1. Power P
1.1. SI unit: W
1.1.1. Watt
1.2. P = W/t = E/t
1.2.1. Power = Work done/ time taken = Energy converted/ time taken
2. Work W
2.1. W = F × s
2.1.1. Work = Force × distance moved in the direction of the force
2.2. SI unit: J
2.2.1. Joules
3. Energy E
3.1. Forms of energy
3.1.1. Light
3.1.2. Electrical
3.1.3. Thermal
3.1.4. Nuclear
3.1.5. Kinetic energy
3.1.5.1. K.E. = 1/2 m v2
3.1.6. Potential energy
3.1.6.1. Gravitational potential energy
3.1.6.1.1. P.E. = mgh
3.1.6.2. Chemical potential energy
3.1.6.3. Elastic potential energy
3.2. Energy cannot be created or destroyed, only converted from one form to another.
3.3. SI unit: J
3.3.1. Joules