BRAINCAKEOhm's Law
Ohm's law states that the current through a metallic conductor is directly proportional to the potential difference across it, provided that its temperature and other physical conditions stay constant.
The resistance of a component is defined as R = V/I, measured in ohms (Ω), where 1 Ω = 1 V A-1. This definition applies to every component, whether or not it obeys Ohm's law.
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Key terms in this lesson
- Potential difference
- The energy transferred per unit charge as charge moves between two points in a circuit.
More in Electric Current
- Energy Transfer
- Electric Power
- Resistance
- Measuring Resistance
- Resistivity
- Superconductivity
- Electronic Components
- Investigating the Characteristics of Components
All 20 lessons in Electric Current · All AQA AS-level Physics topics