Hawkins Electrical Guide v. 01 (of 10) / Questions, Answers, & Illustrations, A progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications

by N. Hawkins

1. Open circuit cells;

Used for intermittent work, where the cell is in service for short periods of time, such as in electric bells, signaling work, and electric gas lighting. If kept in continuous service for any length of time the cell soon polarizes or “runs down,” but will recuperate after remaining on open circuit for some little time.

2. Closed circuit cells.

This type of cell is adapted to furnishing current continuously, as in telegraphy, etc.

With respect to the second method, cells are classified as:

1. One fluid; 2. Two fluid;

Ques. Describe a primary cell.

Ans. A primary cell consists of a vessel containing a liquid in which two dissimilar metal plates are immersed.

In one fluid cells both metal plates are immersed in the same solution. In two fluid cells each metal plate is immersed in a separate solution, one of which is contained in a porous cup which is immersed in the other liquid.