What is the role of the galvanometer in a Wheatstone bridge?

What is the role of the galvanometer in a Wheatstone bridge?

Step 1: Understand that a Wheatstone bridge is a circuit used to measure unknown resistances.
Step 2: Know that the bridge has four resistors arranged in a diamond shape.
Step 3: Recognize that the galvanometer is connected between the two midpoints of the bridge.
Step 4: Learn that the galvanometer measures the current flowing through it.
Step 5: Realize that if the bridge is balanced (the resistances are equal), no current flows through the galvanometer.
Step 6: Understand that if the bridge is unbalanced (the resistances are not equal), current flows through the galvanometer.
Step 7: Conclude that the galvanometer helps to determine if the bridge is balanced or unbalanced.

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