1. What is Wheatstone Bridge?

The Wheatstone Bridge is a circuit used to measure an unknown electrical resistance by balancing two legs of a bridge circuit. When balanced, the ratio between the known resistances equals the ratio between the unknown resistance and another known resistance.

2. How Does the Calculator Work?

The calculator uses the Wheatstone Bridge formula:

Where:

• \( R_x \) — Unknown resistance (Ω)
• \( R1 \) — Known resistor (Ω)
• \( R2 \) — Known resistor (Ω)
• \( R3 \) — Known resistor (Ω)

Explanation: The equation calculates the unknown resistance when the bridge is balanced (no current flows through the galvanometer).

3. Importance of Wheatstone Bridge

Details: Wheatstone bridges are crucial for precise resistance measurements in electrical circuits, strain gauge measurements, and various sensor applications.

4. Using the Calculator

Tips: Enter all known resistances in ohms (Ω). All values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What makes the Wheatstone Bridge accurate?
A: Its null measurement principle makes it highly accurate as it doesn't depend on the galvanometer's calibration.

Q2: What are typical applications?
A: Used in strain gauges, thermistors, light detectors, and other precision resistance measurements.

Q3: What's the sensitivity of the bridge?
A: Sensitivity depends on the bridge voltage and galvanometer characteristics. Higher voltage increases sensitivity.

Q4: Can it measure very small resistances?
A: For very small resistances, a Kelvin Bridge (modified Wheatstone Bridge) is more appropriate.

Q5: What affects measurement accuracy?
A: Resistor precision, bridge voltage stability, and galvanometer sensitivity affect accuracy.