Electric power, like mechanical power, is represented by the letter P in electrical equations. The term wattage is used colloquially to mean "electric power in watts."
[edit] Direct current In direct current resistive circuits, electrical power is calculated using Joule's law:
P = V.I
where P is the electric power, V the potential difference, and I the electric current.
Joule's law can be combined with Ohm's law (V = RI) to produce alternative expressions for the dissipated power:
P = I*2. R
and
P =V*2/R
where R is the electrical resistance.
[edit] Direct current In direct current resistive circuits, electrical power is calculated using Joule's law:
P = V.I
where P is the electric power, V the potential difference, and I the electric current.
Joule's law can be combined with Ohm's law (V = RI) to produce alternative expressions for the dissipated power:
P = I*2. R
and
P =V*2/R
where R is the electrical resistance.
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