# Potential Divider - Online Calculator

## Output voltage from a potential divider

A potential divider is the simplest way of producing a source of lower e.m.f. from a source of higher e.m.f.

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)

### Example - Potential Divider

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)

The current through the potential divider R1 and R2 (ex. output current) can be calculated by using Ohm's law

I = V / R

= (12 V) / ((10 Ω) + (20 Ω))

= 0.4 A

The power cocumption of the divider can be calculated

P = V I

= (12 V) (0.4 A)

= 4.8 W

### Potential Divider - Calculator

input voltage (volts)

resistor R1 (ohm)

resistor R2 (ohm)

## Related Topics

• Electrical - Electrical units, amps and electrical wiring, wire gauge and AWG, electrical formulas and motors

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