If the components in a series circuit have different resistances, the potential difference does not divide equally across them. The diagram shows a 6 Ω resistor in series with a 2 Ω resistor.

Using properties of a series circuit, the sum of the voltages across the LED and resistor R must equal the supply voltage. \({V_s} = {V_{LED}} + {V_R}\) Now substitute the supply voltage (\(6V ...