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Current Divider - Online Calculator

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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

R T = R1 R2/ (R1 + R2)      (1)


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 R1 R2/ (R1 + R2)   (2)


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

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 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

R - total resistance (ohms)

I1 - split current (amps)

I2- split current (amps)

I - total current (amps)

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