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There are some materials which offer some resistance to the current flow; they are not good Electrical conductors or good Electrical insulators. They are resistive materials, for example graphite, iron, and certain synthetic materials.

The magnitude that represents this characteristic is the resistance, and it is measured in ohms. An ohm (referred to by the Greek letter Ω (Omega)) is the SI unit of resistance (R). It can be defined by Ohm's law and the equation:

R=V/I

where ${\textstyle R}$ is resistance in ohms, ${\textstyle V}$ is voltage in volts, and ${\textstyle I}$ the current in amperes.

The ohm was named after Georg Ohm.

SI units
Authority: International System of Units (BIPM)
Base units	ampere candela kelvin kilogram metre mole second
Units based on other units	becquerel coulomb degree Celsius farad gray henry hertz joule katal lumen lux newton ohm pascal radian siemens sievert steradian tesla volt watt weber
Other SI units	astronomical unit bar dalton day decibel degree of arc electronvolt hectare hour litre minute minute of arc neper second of arc tonne atomic units natural units
See also	Conversion of units Metric prefixes Systems of measurement
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