Wheatstone Bridge Calculator: Determine Unknown Resistance (Rx)

Calculate Unknown Resistance (Rx) in a Wheatstone Bridge

Quickly determine the unknown resistance (Rx) in a balanced Wheatstone Bridge circuit. Input the three known resistance values (R1, R2, R3) into our easy-to-use calculator to get instant, accurate results. Ideal for students, engineers, and hobbyists for precise electrical measurements and circuit analysis.

Formula:

The Wheatstone Bridge is used to precisely measure unknown electrical resistances. In a balanced bridge circuit, the ratio of resistances in one leg is equal to the ratio in the other. The formula for calculating the unknown resistance (Rx) is:

Rx = (R2 × R3) / R1

Where:

  • R1 = Known resistance in the first arm (Ohms)
  • R2 = Known resistance in the second arm (Ohms)
  • R3 = Known resistance in the third arm (Ohms)
  • Rx = The unknown resistance being measured (Ohms)

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