Wheatstone Bridge Balance

📊 intermediate

$$\frac{P}{Q} = \frac{R}{S}$$

Condition for zero current through the galvanometer in a bridge circuit.

Variables & Units

$P, Q, R, S$

Resistances of the four arms

Unit: Ohm

Key Information

📐 Derived From

Kirchhoff's Laws.

💡 Example

Using a Meter Bridge to find unknown resistance.

🔧 Applications

Precision resistance measurement.

⚠️ Constraints

Bridge must be balanced ($I_g = 0$).

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