Πώς να υπολογίσετε το Wheatstone

Τι είναι το Wheatstone;

The Wheatstone bridge is a circuit used to measure unknown electrical resistance by balancing two legs of a bridge circuit. R_unknown = R3 × (R2/R1).

Τύπος

At

R3/Rx — solve for unknown Rx — R3/Rx — solve for unknown Rx

R1

R3/Rx — solve for unknown Rx — R3/Rx — solve for unknown Rx

R2

R3/Rx — solve for unknown Rx — R3/Rx — solve for unknown Rx

R3

R3 value — Variable used in the calculation

Rx

Rx value — Variable used in the calculation

Οδηγός βήμα προς βήμα

1. 1Four resistors arranged in a diamond (bridge) configuration
2. 2A galvanometer in the centre detects current imbalance
3. 3At balance: R1/R2 = R3/Rx — solve for unknown Rx

Worked Examples

Common Mistakes to Avoid

• ✕Assuming the bridge must be exact — modern circuits use operational amplifiers for nulling
• ✕Ignoring lead resistance in precision measurements

Frequently Asked Questions