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# Current Divider - Online Calculator

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

R T = R 1 R 2 / (R 1 + R 2 )      (1)

where

R T = total resistance (ohms, Ω)

R n = resistance in branch n (ohms, Ω )

The voltage difference across the circuit

U = I R T

= I R 1 R 2 / (R 1 + R 2 )   (2)

where

U = electrical potential (volts, V)

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

Split current I 1 can be calculated

I 1 = U / R 1

= (I R 1 R 2 / (R 1 + R 2 ) ) / R 1

=   I R 2 / (R 1 + R 2 )     (3)

Split current I 2 can be calculated

I 2 = U / R 2

= (I R 1 R 2 / (R 1 + R 2 ) ) / R 2

=   I R 1 / (R 1 + R 2 )     (4)

### Example - Current Divider

The total resistance in a current divider with supply voltage 3.3 V and resistor R 1 = 220 ohm and resistor R 2 =  47 ohm can be calculated as

R T = ( 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 R 1 can be calculated

I 1 = (3.3 V) / (220 ohm)

= 0.015 amps

= 15 mA

The current through resistor R 2 can be calculated

I 2 = (3.3 V) / (47 ohm)

= 0.070 amps

= 70 mA

### Current Divider - Online Calculator

R - total resistance (ohms)

I 1 - split current (amps)

I 2 - split current (amps)

I - total current (amps)

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