OCR GCSE Combined Science A · J250
Specification P3.2d, P3.2g · Physics Paper 1
Revise: Ohm's Law and Variable ResistanceA metal wire or fixed resistor behaves as an ohmic conductor when its temperature and other physical conditions remain constant. Its resistance stays constant as the current changes. This behaviour is described by Ohm’s law: current is directly proportional to potential difference.
- Revise: Linear and Non-linear Circuit Elements
The current through a conductor is directly proportional to the potential difference across it, provided its temperature remains constant.