How do you derive the formula V = IR?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
The derivation comes from the definition of resistance:
- Resistance is defined as: R = V/I (the ratio of voltage to current)
- Multiply both sides by I: R × I = V
- Rearrange: V = I × R (or V = IR)
This mathematical relationship was discovered experimentally by Georg Ohm in 1827, showing that voltage and current are proportional for most conductors at constant temperature.
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