Post Office Box Trainer Manufacturer,Supplier and Exporter in India
Product Code : SCL-EELE-12350
Indian Lab Suppliers supplies the Post Office Box Trainer (Product ID: 12350) as part of its electronics engineering lab equipment range. It is a post office box set-up, working on the Wheatstone bridge principle, for measuring unknown resistance and wire resistivity.
Quick Answer
The post office box is a set of ratio and rheostat resistances arranged as a Wheatstone bridge. Students determine the resistance of constantan and nichrome wire samples, calculate the resistivity of each material from its length and diameter, and verify series and parallel combinations of resistors. A 5 V, 200 mA DC supply is built in and bridge balance is read on a 3½-digit digital panel meter in place of a pointer galvanometer.
Key Specifications
| Parameter | Detail |
|---|---|
| Samples | Constantan and nichrome wire |
| Experiments | Unknown resistance; resistivity of wire material; series and parallel resistances |
| DC supply | 5 V at 200 mA |
| Null detector | 3½-digit DPM |
| Mains | 230 V AC ±10%, 50 Hz |
| Fuse | 100 mA |
Where This Is Used
Used in physics and basic electrical labs; the same principle is used on the Wheatstone Bridge (Product ID: 12330) and the Portable Wheatstone Bridge (Product ID: 14512). Browse the full Electronics Engineering Lab Equipment range or related Electricity and Magnetism products.
Frequently Asked Questions
What principle does the post office box use?
The Wheatstone bridge balance condition.
Which wire samples are supplied?
Constantan and nichrome.
How is balance detected?
On a 3½-digit digital panel meter.
Related Categories
Electronics Engineering Lab Equipment · Electricity and Magnetism · Physics Lab Equipment
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