electric power

Electrical Power

• Electric current is the rate of flow of charge.

• When an electrical charge flows through a resistor,

 electrical energy is transformed into heat energy.

• power = energy transformed / time taken

• Power, voltage and current are related by the equation:

power = voltage x current

(watt, W) (ampere, A) (volt, V)

Energy, voltage and charge are related by equation:

energy transformed = voltage × charge

(joule, J) (volt, V) (coulomb, C)

• charge = current × time

(coulomb, C) (ampere, A) (second, s)