Wheatstone Bridge

The video tutorial explains how to measure an unknown resistance using a Wheatstone bridge. It describes the components involved, including known and unknown resistances, and the conditions for a balanced bridge where no current flows through the galvanometer. The tutorial covers the application of junction and loop rules to derive the balance condition, which is crucial for determining unknown resistance. By adjusting the variable resistance until the galvanometer shows no deflection, the unknown resistance can be calculated using the balance condition formula.

What is the primary purpose of using a Wheatstone bridge?

• To measure power

• To measure an unknown resistance

• To measure current

• To measure voltage

In a balanced Wheatstone bridge, what is the current through the galvanometer?

• Maximum

• Minimum

• Zero

• Equal to the current through the resistors

Which rule is applied to derive the balance conditions in a Wheatstone bridge?

• Lenz's Law

• Faraday's Law

• Kirchhoff's Junction Rule

• Ohm's Law

What is the balance condition equation for the Wheatstone bridge?

• R1/R3 = R2/R4

• R2/R1 = R4/R3

• R3/R1 = R2/R4

• R1/R2 = R3/R4

How is the unknown resistance calculated once the Wheatstone bridge is balanced?

• R4 = R2 * R3 / R1

• R4 = R1 * R2 / R3

• R4 = R3 * R2 / R1

• R4 = R1 * R3 / R2