Wheat Stone Bridge

Project Description: This project involves building a Wheatstone Bridge circuit to measure unknown resistance with high accuracy. The circuit is powered by a simple DC power supply, such as a battery, and consists of four resistors arranged in a diamond configuration. Two resistors have known values, one is a variable resistor, and the fourth is the unknown resistor to be measured.

The key to the Wheatstone Bridge is balancing the circuit so that no current flows through the galvanometer. This occurs when the ratios of the resistances on either side of the bridge are equal. At this point, the unknown resistance can be easily calculated using the formula:

Rx=R2×R3R1R_x = \frac{R_2 \times R_3}{R_1}Rx​=R1​R2​×R3​​

Where:

• RxR_xRx​ is the unknown resistance,
• R1R_1R1​ and R2R_2R2​ are the known resistors,
• R3R_3R3​ is the variable resistor.

The project provides an excellent opportunity for students to understand the concepts of electrical resistance, circuit balancing, and precision measurement. It also highlights the practical applications of the Wheatstone Bridge in various fields such as strain gauges, temperature sensors, and other resistive sensors.

Applications:

• Measurement of unknown resistances in laboratory experiments
• Calibration of measuring instruments
• Use in sensor circuits (e.g., strain gauges)
• Educational demonstrations of electrical principles