Commonly Used Energy Meters | Instruments | Electrical Engineering
In this article we will discuss about the commonly used D.C and A.C energy meters. 1. D.C. Energy Meters: (A) Ferranti Mercury Meter: It is a very commonly used energy meter of mercury ampere-hour type. The construction and connection of this meter are shown in fig. 68. Ferranti mercury meter consists of a disc revolving between two permanent magnets,—one acting [...]