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Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Introducing the constant of proportionality, the resistance, one arrives at the usual mathematical equation that describes this relationship:

### History

### Scope

### Microscopic origins

### Hydraulic analogy

### Circuit analysis

### Temperature effects

### Relation to heat conductions

### Other versions

### External links and further reading