Electrodynamics/Resistance and Resistors

Resistance (R) is defined as:

$R=\frac{V}{I}$

where V is the potential difference between the two points, and I is the current passing through.

The SI units for R is ohms (represented by $\mathrm{\Omega }$).

Ohm's Law states that for an ohmic resistor, the resistance is constant - it does not bear any relationship with respect to the potential difference and the current.