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Current Divider - Online Calculator

Electric current divider

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A current divider is a linear circuit that produces an output current that is a fraction of the input current.

Current is split between the branches of the divider. The total resistance in the electrical circuit can calculated

RT = R1 R2 / (R1 + R2)      (1)

where

RT = total resistance (ohms, Ω)

Rn = resistance in branch n (ohms, Ω)

The voltage difference across the circuit

U = I RT

   = I R1 R2 / (R1 + R2)   (2)

where

U = electrical potential (volts, V)

I = total current through the circuit (amps, A)

Split current I1 can be calculated

I1 = U / R1

= (I R1 R2 / (R1 + R2) ) / R1

=   I R2 / (R1 + R2)     (3)

Split current I2 can be calculated

I2 = U / R2

= (I R1 R2 / (R1 + R2) ) / R2

=   I R1 / (R1 + R2)     (4)

Example - Current Divider

The total resistance in a current divider with supply voltage 3.3 V and resistor  R1 = 220 ohm and resistor R2 =  47 ohm can be calculated as

RT = (220 ohm) (47 ohm) / ((220 ohm) + (47 ohm))

    = 38.7 ohm

The total current through the current divider can be calculated

I = (3.3 V) / (38.7 ohm)

    = 0.085 amps

    = 85 mA

The current through resistor R1 can be calculated

I1 = (3.3 V) / (220 ohm)

    = 0.015 amps

    = 15 mA

The current through resistor R2 can be calculated

I2 = (3.3 V) / (47 ohm)

            = 0.070 amps

            = 70 mA

Current Divider - Online Calculator

R1 - resistance (ohms)          I1 - split current (amps)

R2 - resistance (ohms)          I2 - split current (amps)

U - electrical potential (volts)

R - total resistance (ohms)   I - total current (amps)


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