The amount of electric power transformed in heat in a conductor (pure resistance) is equal the product of the conductor by the square of the amount of current flowing through it.
Formula 1
P = R x I2
Where:
P is the amount of Power converted in heat in watts (W)
R is the resistance of the conductor in ohm (Ω)
I is the current in amperes (A)
Derivated Formulas:
Formula 2:
R = P/I2
Formula 3
I = ?P/R
Formula 4
P = V2/R
Formula 5
V = √P x R
Formula 6
R = V2/P
Application Example:
Calculate the amount of Power converted into heat by a 100-ohm resistor with a 2 A current flowing through it.
Data:
R = 100 Ω
I = 2 amperes
P = ?
Using formula 1:
P = 100 x 22 = 100 x 4 = 400 W
