Ohm’s law

For an ohmic conductor under fixed conditions, voltage equals resistance multiplied by current.

U = R × I

Worked example

10 Ω ; 0.5 A → 5 V

What the formula tells you

For an ohmic conductor under fixed conditions, voltage equals resistance multiplied by current.

Watch the units

Ohm’s law describes ohmic behaviour; many components are not linear over all conditions.