BRAINCAKEResistance
The electrical resistance of a component is a measure of its opposition to the flow of electric current through it.
Electrical resistance is the ratio of the potential difference across the component to the current flowing through that component.
| resistance | = | p.d. across component current through component |
| R | = | V I |
| ohms | = | volts amps |
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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.
- Superconductivity
- The property of certain materials of having exactly zero electrical resistivity below a characteristic critical temperature.
More in Electric Current
- The Emf of a Source
- Potential Difference
- Energy Transfer
- Electric Power
- Measuring Resistance
- Ohm's Law
- Resistivity
- Superconductivity
All 20 lessons in Electric Current · All AQA AS-level Physics topics