Loaded voltage divider
Calculator for calculating the values on a loaded voltage divider
This function calculates voltages, currents and resistances on a loaded voltage divider.
The values of the voltage U2 or the load resistance RL can be specified at the output of the circuit. The input of the voltage U2 is preset.
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Formulas for the loaded voltage divider
The voltage divider is a series circuit made up of two resistors that divide an electrical voltage. When the voltage divider is loaded, a further resistor (load resistor) is connected in parallel to the second resistor. The ratio of the partial voltages corresponds to the ratio of the resistors R1 and the resistance of the parallel connection of (R2 and RL).
For the calculation, the total resistance of R2 and RL must therefore first be calculated using the following formula:
\(\displaystyle U_{2L}=\frac{R_2·R_L}{R_2+R_L}\)
Then the voltage U2 is calculated according to the formula:
\(\displaystyle U_2=U· \frac{R_{2L}} {R_1+R_{2L}}\)
The partial currents are calculated according to Ohm's law
\(\displaystyle I_1=\frac{U_1} {R_1}\;\;\;\;\;I_2=\frac{U_2} {R_2}\;\;\;\;\;I_L=\frac{U_2} {R_L}\)
More Formulas
\(\displaystyle R_L=\frac{R_2·R_{2L}}{R_2-R_{2L}}\)
\(\displaystyle R_{2L}=\frac{U_2·R_1}{U-U_2}\)
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