Wheatstone bridge calculator
Wheatstone bridge formulas

A Wheatstone bridge is a circuit used to measure the resistance of a device under test. It consists of four resistors arranged in a bridge configuration, as shown below:

  A--R1--B
          |
  D--R3--C
          |
  E--R2--F

The Wheatstone bridge is often used to measure very small resistances, such as those found in strain gauges or other sensors. It works by balancing the voltage across the bridge, which occurs when the following equation is satisfied:

Voltage_A - Voltage_B = Voltage_C - Voltage_D

To solve for the resistance of the device under test (Rx), you can use the following formula:

Rx = (R1 * R3) / (R2 - R3)

This formula assumes that R1 and R3 are known and that R2 is adjustable. By adjusting R2 and measuring the resulting voltage across the bridge, you can determine the value of Rx.