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# Electric Current Calculator

Last updated: Monday, May 01, 2023
Select a formula below
Ohm's Law
Charge & Time
Power & Potential
Power & Resistance

The relationship between electric power, electric current and electric resistance is given by the formula P = I^2 * R, where P is the electric power in watts, I is the electric current in amperes, and R is the electric resistance in ohms. This formula is known as Joule's law and expresses the fact that the electric power dissipated in a resistive element is proportional to the square of the electric current flowing through it and to its resistance. Therefore, if the electric power and the electric resistance of a circuit are known, the electric current can be derived by rearranging the formula as follows: I = sqrt(P/R).

An alternative formula for determining the electric current can be derived from:
$$P$$ $$=$$ $$I^2$$ $$\cdot$$ $$R$$
$$I$$: the electric current
$$R$$: the resistance
$$P$$: the electric power
The SI unit of electric is: $$ampere\text{ }(A)$$

## Find I

Use this calculator to determine the electric current when the electric power and the resistance are given.
the resistance
$$R$$
$$ohm$$
the electric power
$$P$$
$$watt$$
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