Electric current is the rate of flow of electric charge, typically measured in amperes (A). Ohm's law states that the current flowing through a conductor is directly proportional to the voltage applied across it, provided that the temperature and other physical conditions remain constant.

Mathematically, Ohm's law can be represented as I = V/R, where I is the current flowing through the conductor in amperes, V is the voltage applied across the conductor in volts, and R is the resistance of the conductor in ohms. This means that if the voltage is doubled, the current will also double, provided that the resistance remains constant.

Ohm's law is useful for designing and analyzing electrical circuits, as it allows us to calculate the current flowing through a circuit for a given voltage and resistance, or the resistance of a circuit for a given voltage and current. It is also used in the design and operation of various electronic devices such as radios, televisions, and computers.

The formula for determining the electric current can be derived from Ohm's law: