A Wheatstone bridge is a precise electrical circuit with four resistors in a diamond shape, used to measure an unknown resistance by balancing two voltage dividers; it works on the principle of null deflection (zero current in the detector) to find the unknown value accurately, commonly used in sensors like strain gauges for applications like force/weight measurement. When balanced, the ratio of known resistances equals the ratio of the unknown and the variable resistor, allowing calculation of the unknown resistance (Rx) using the formula: \(Rx=R3\times (R2/R1)\)

V = IR

\(f(x)=\frac{a_{0}}{2}+\sum _{n=1}^{\infty }[a_{n}\cos (\frac{n\pi x}{L})+b_{n}\sin (\frac{n\pi x}{L})]\)