Ohm's Law

Ohm's Law is a fundamental law of electricity that relates the current flowing through a conductor to the voltage applied across it. It states that the current through a conductor between two points is directly proportional to the voltage across the two points.

Formula

The formula for Ohm's Law is I = V/R, where I is the current in amperes, V is the voltage in volts, and R is the resistance in ohms.

Unit of Resistance

The unit of resistance is the ohm, which is defined as the resistance between two points on a conductor when a constant voltage of 1 volt produces a current of 1 ampere.

Explanation

Ohm's Law can be used to define the unit of resistance as follows:

- According to Ohm's Law, the current through a conductor is directly proportional to the voltage applied across it.
- If we apply a constant voltage to a conductor, the current flowing through it will depend on the resistance of the conductor.
- The resistance of a conductor is defined as the ratio of the voltage applied across it to the current flowing through it.
- Therefore, if we apply a constant voltage of 1 volt to a conductor and measure the current flowing through it, we can determine the resistance of the conductor as 1 ohm.
- This means that the resistance of a conductor is 1 ohm if a constant voltage of 1 volt produces a current of 1 ampere.
- Thus, the unit of resistance is defined as the ohm, which is equal to the resistance between two points on a conductor when a constant voltage of 1 volt produces a current of 1 ampere.