Voltage Divider Calculator

Voltage Divider Calculator

We are offering the voltage divider calculator, which will help you to calculate the voltage drops on every resistor load, when it is connected in the series. All you need is to enter the total value of  voltage supply and hit the = button.

Enter total voltage: VT = Volts [V]
Enter resistance of first load: R1 = Ohms [Ω]
Enter resistance of second load: R2 = Ohms [Ω]
Enter resistance of third load:

(optional)

R3 = Ohms [Ω]
       
Voltage drop of R1: V1 = Volts [V]
Voltage drop of R2: V2 = Volts [V]
Voltage drop of R3: V3 = Volts [V]

Voltage divider rule

The rule to find the value for a DC circuit with the constant voltage source VT and the value of resistors in series, the value of voltage drop Vi measured in resistor Ri can be given as,

V_i=V_T\: \frac{R_i}{R_1+R_2+R_3+...}

Voltage Divider

We are offering the voltage divider rule to help you find out the value of voltage over a load in an electrical circuit, when a number of loads are connected in a series.

  1. Voltage divider rule for DC circuit
  2. Voltage divider rule for AC circuit
  3. Voltage divider calculator

Voltage divider rule for DC circuit

For a DC circuit with constant voltage source VT and resistors in series, the voltage drop Vi in resistor Ri is given by the formula:

V_i=V_T\: \frac{R_i}{R_1+R_2+R_3+...}

where the units represents the following,

Vi – voltage drop in resistor Ri in volts [V].

Ri – resistance of resistor Ri in ohms [Ω].

R2 – resistance of resistor R2 in ohms [Ω].

VT – the equivalent voltage source or voltage drop in volts [V].

R1 – resistance of resistor R1 in ohms [Ω].

R3 – resistance of resistor R3 in ohms [Ω].

For Example,

The value of Voltage source of VT=20V, when it is connected to resistors in series, R1=20Ω, R2=40Ω.

Hence, find the measure of voltage drop on resistor R2.

V2 = VT × R2 / (R1+R2) = 20V × 40Ω / (20Ω+40Ω) = 13.333333333333334 V

Voltage divider for AC circuit

For an AC circuit with the value voltage source VT and with loads in series, the value of voltage drop Vi in load Zi can be calculated with the formula,

V_i=V_T\: \frac{Z_i}{Z_1+Z_2+Z_3+...}

Where, the values are,

Vi – voltage drop in load Zi in volts [V].

Zi – impedance of load Zi in ohms [Ω].

Z1 – impedance of load Z1 in ohms [Ω].

VT – the equivalent voltage source or voltage drop in volts [V].

Z3 – impedance of load Z3 in ohms [Ω].

Z2 – impedance of load Z2 in ohms [Ω].

Check the calculations right away!

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