BRAINCAKEOhm's Law
Ohms Law states that for a metallic conductor kept at constant temperature the current in the conductor is directly proportional to the potential difference across it.
V + I R
potential difference = current × resistance
A graph of current against potential difference will be a straight line through the origin.
A graph of current against potential difference will be a straight line through the origin.
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Key terms in this lesson
- potential difference
- The work done, or energy transferred, per unit charge as charge moves between two points in a circuit.
- resistance
- The ratio of the potential difference across a component to the current through it.
More in Electricity
- Potential Difference
- Electromotive Force
- The Electron Gun
- Resistance
- Temperature and Resistance
- IV Graphs
- Diodes
- Resistivity
All 30 lessons in Electricity · All OCR AS-level Physics topics