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Engineering ToolBox > Potential Divider
The output voltage from a potential divider can be calculated as
Vout = Vin R2 / (R1 + R2) (1)
where
Vout = output voltage (V)
R = resistance (Ohms, Ω)
Vin = input voltage (V)
The output voltage from a potential divider with two resistors R1 = 10 Ohms and R2 = 20 Ohms, and input voltage 12 V can be calculated as
Vout = 12 (V) 20 (Ω) / (10 (Ω) + 20 (Ω))
= 8 (V)