BRAINCAKEResistivity
| R | = | ρ L A |
| resistance | = | resistivity × ;length(m) cross-section area(m2). |
ρ is resistivity, L is the length of the wire and A is the cross-sectional area of the wire.
Resistivity is a property of the material.
ρ units are ohm metre (Ω m)
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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.
- Resistance
- The ratio of the potential difference across a component to the current flowing through it, measured in ohms.
More in Electric Current
- Electric Power
- Resistance
- Measuring Resistance
- Ohm's Law
- Superconductivity
- Electronic Components
- Investigating the Characteristics of Components
- IV Graphs
All 20 lessons in Electric Current · All AQA AS-level Physics topics