What is a Wheatstone Bridge used for?

• A. Measuring capacitance
• B. Detecting changes in current flow via changes in resistance
• C. Storing electrical energy
• D. Generating electrical energy

Answer: (B)

The Wheatstone Bridge is primarily used for measuring unknown resistances by balancing two legs of a circuit. It operates on the principle of comparing two resistances and can detect changes in current flow through its sensitivity to variations in resistance. When any changes occur in the resistance values within the circuit, such as temperature fluctuations or material alterations, the bridge becomes unbalanced, which leads to variations in current flow. This allows technicians to precisely measure the resistance of an unknown component by adjusting the known resistances until the bridge is balanced again, indicating the value of the unknown resistance.

While measuring capacitance, storing electrical energy, or generating electrical energy involve different circuit components and principles, they are not the primary functions of a Wheatstone Bridge. Instead, the bridge's capability to detect small changes in resistance makes it a crucial tool for electrical measurements and assessments.