The electrical resistance is measured in (the SI unit for resistor) ohm, and Ω represents it. The unit ohm (Ω) is named honour of the great German physicist and mathematician Georg Simon Ohm. Resistance (also known as ohmic resistance or electrical resistance) is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω). When the potential difference is applied to a conductor, the current starts flowing, or the free electrons start moving. While moving, the free electrons collide with the atoms and molecules of the conductor. Due to collision or obstruction, the rate of flow of electrons or electric current is restricted. The resistance of conducting material is found to be directly proportional to the length of the material. It is inversely proportional to the cross-sectional area of the material. Resistors are manufactured and specified over a wide range of values.

Dency Varghese

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