PhysRefPhysics reference
Electricity & Magnetism
V=IRV = IR

Ohm's Law for ohmic conductors.

Variables

V
Voltage
Potential difference
V
I
Current
Electric current
A
R
Resistance
Electrical resistance
Ω

Derivation

Empirical relationship for ohmic materials.

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Common questions

What is the Ohm's Law formula?

Ohm's Law is written V = IR. Ohm's Law for ohmic conductors. It belongs to Electricity & Magnetism, under Electric Circuits.

What are the units in V = IR?

In SI units, V is voltage, measured in kg·m²/(A·s³); I is current, measured in A; R is resistance, measured in kg·m²/(A²·s³).

How is the Ohm's Law formula derived?

Empirical relationship for ohmic materials. The result is V = IR.