Resistance

Resistance Points : Resistance, Definition, Unit, Definition of One Ohm, Multiples of Ohm, Factors Affecting Resistance Definition Resistance is a measure of apposition to the motion of free electrons i.e. current due to their continues collision with the atoms of lattice of conductor. Unit Unit of resistance is ohm. Definition of One Ohm The resistance of a column of mercury of length 106.3 cm having a uniform cross section of one square milli metre and weighing 14.4521 g at 0°C is one ohm. OR One ohm is the resistance of a conductor, when a potential difference of one volt, across it maintains a current of 1 ampere. Multiples of Ohm One kilo Ohm(1KΩ) = 1000 ohm(10³Ω)
One mega ohm (1MΩ) = 1000000 ohm (10⁶Ω) Multiples of Ohm Resistance of a conductor depends upon the following factors.
• Nature of material
• Length of the conductor
• Area of cross section of conductor
• Temperature of the conductor