A ==Key Stage 3=====Meaning==='''Resistance''' is a description of how difficult it is to [[increase]] the [[Electrical Current|current]] through a [[Electrical Conductor|conductor]] when changing the [[potential difference]]. ===About Resistance===: The [[SI Unit|unit]] of '''resistance''' is the [[Ohm]] ([[Ω]]).: '''Resistance''' cannot be directly [[measure]]d. '''Resistance''' must be calculated by dividing the [[Potential Difference]] by the [[Electrical Current|Current]].: [[Electrical Conductor|Conductors]] have a low '''resistance''' and [[Electrical Insulator|insulator]]s have a high '''resistance'''.