There are 10 types of energies
Magnetic
Kinetic
Heat
Nuclear
Light
Gravitational
Chemical
Sound
Electrical
Elastic
Energy can be converted from one form to another but they cannot be created or destroyed.
Energy can be transferred usefully, store or dissipated as heat energy
Efficiency
Efficiency = (useful energy out / total energy in) x 100
Electrical appliances energy calculations
E= P*t
Energy (kWh) = Power (kW) x Time (h)
Energy (J) = Power (W) x Time (s)
Cost
Total cost = power (kWh) * time (h) * cost per unit
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