Post Office Box

Post Office Box

Catalogue No. – 16605
plug type [table “16605” not found /]


A Post Office Box (PO Box) is a laboratory apparatus that is used to measure the resistance of a given material. It consists of a rectangular box made of an insulating material, such as wood or plastic, with two metal terminals mounted on opposite sides of the box. The terminals are connected to a battery and a galvanometer, which is used to measure the flow of electrical current through the material.

To measure the resistance of a material using a PO Box, the material is placed in the box and the terminals are connected to the battery and the galvanometer. A known voltage is then applied to the material, and the resulting current flow is measured using the galvanometer. By measuring the voltage and current, the resistance of the material can be calculated using Ohm’s Law.

PO Boxes are commonly used in laboratory settings for experiments involving electrical resistance, conductivity, and the properties of materials. They can also be used in scientific research, such as in studies of the electrical properties of metals and other materials.