Description
A post office box is a compact form of Wheatstone’s bridge. A Post Office Box can also be used to measure an unknown resistance. It is a Wheatstone Bridge with three arms, P, Q, and R, while the fourth arm is the unknown resistance. P and Q are known as the ratio arms, while R is known as the rheostat arm.
Post Office Box (PO Box) for Physics Practical Class & Exam
Plug-in type. The heavy brass contact blocks are bonded to the vulcanite by a double nut system. The plugs & lugs are cut to a finer taper & are interchangeable. The plug heads are machine-molded of bakelite. Each resistor is independently mounted with double leads. The accuracy of Constantan coils is 0.1% for lower values & 0.5% for higher values. Resistor: the best-imported constant wire is wound on ebonite spools; the method adopted is non-inductive & non-magnetic. Each resistor is dipped in boiling wax. Provided as above with 3 ratio coils of 1000, 100 & 10 ohms. Rheostat arm 15,000 ohms. Two tapping keys with silver contacts are provided for the battery & galvanometer in a teakwood case with a hinged lid.
- Durable Construction: Made from high-quality, corrosion-resistant metal with insulated plugs ensuring long-lasting use in physics and electrical experiments.
- Accurate Electrical Connections: Designed for quick and secure connection of resistors, capacitors, and other components for circuit testing and educational demonstrations.
- Ideal for Labs & Institutions: Perfect for schools, colleges, and research laboratories for demonstrating Ohm’s Law, Wheatstone Bridge, and other basic electrical principles.
- User-Friendly Design: Features clearly marked terminals and sturdy plug connections for easy handling and reliable performance during experiments.
- Trusted Scientific Quality: Professionally manufactured Post Office Box Plug Type instrument — ideal for students, teachers, and lab technicians for precise electrical measurements.
Images are reference only. Actual product may be different.
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Post Office Box Plug Type, India
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