EDZA AIVirtual Lab
Determine an unknown resistance using the Wheatstone bridge principle. Set the resistance box, close the key, and locate the null point.
Interactive apparatus · On smaller screens, scroll sideways to inspect the full setup.
Choose R and close key K to connect the battery.
Move the jockey until the galvanometer reads approximately zero. Use fine adjustment near balance.
Record at least three readings using different values of R, then find the mean resistance.
A uniform wire has resistance proportional to its length. At the null point, the two junctions have the same potential.
X is in the left gap. l is measured from end A, in cm.
This simulation uses a uniform 100 cm wire (2 Ω total), an ideal 2 V source, and a 100 Ω galvanometer. Lead and contact resistances are neglected. In a real lab, touch the jockey gently; do not slide it while pressing. Open the key between readings to avoid heating. Swapping gaps helps check end errors in a real bridge.
The green null window is ±0.15 cm around the exact balance point, representing finite position resolution. Recorded results can therefore differ slightly from X.
| TRIAL | KNOWN R (Ω) | GAP OF X | l (cm) | 100 − l (cm) | CALCULATED X (Ω) |
|---|
Balance the bridge, then record your observation.