# Current Divider - Online Calculator

## Electric current divider

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*can be calculated as

_{2}= 47 ohm*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 _{1} - resistance (ohms) I_{1} - split current (amps)*

* R _{2} - resistance (ohms) I_{2} - split current (amps)*

*U - electrical potential (volts)*

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