Define the flow of current

Current flow basically means the flow of electric charges with respect to time. In an electric circuit, when the electric charge is flowing in one direction, the current will flow in the opposite direction.

The electric current flow starts from the negative terminal to the positive terminal of a battery, as the electron will flow from the positive terminal to the negative terminal.

From Ohm's law, the expression for the current is <i>V=IR</i>

Here, <i>V</i> is the voltage of the battery, <i>R</i> is the resistance connected in the circuit, and <i>I</i> is the current flow in the circuit.

From Ohm's law, the current can be defined as the voltage through the circuit per unit resistance.

The unit of current is Ampere (A).

When the current flows through the circuit, it causes heating in that device; as a result, we can get light in an incandescent light bulb. This heating is known as Joule heating.

Current is of two types:

• DC current, which is created from a Dc voltage source

• AC Current, which is created from an Ac voltage source