What is the unit of electrical resistance?

The unit of electrical resistance is the ohm. Resistance is a measure of how much a component opposes the flow of electrical current. The concept of resistance is defined by Ohm's Law, which states that the voltage across a resistor is equal to the current flowing through it multiplied by the resistance. This relationship is expressed mathematically with the formula V = I * R, where V is voltage, I is current, and R is resistance measured in ohms.

Other electrical units mentioned have different specific meanings and roles in circuits. The coulomb is a unit of electric charge, the volt measures electrical potential difference, and the watt is a unit of power, which describes the rate of energy transfer. Each of these units plays an important role in electricity and electronics, but only the ohm specifically quantifies resistance.