INTRODUCTION

In the field of engineering, various types of quantities such as physical, chemical, mechanical, thermal, and electrical are involved. For records, these quantities are required to be measured by different methods using different types of instruments. Electrical measuring instruments are widely used in the modern engineering world because of their accuracy, convenience, and reliability. These instruments are not only used to measure the electrical quantities but are also used to measure other non-electrical quantities such as temperature, strain, deformation, velocity, and pressure with the help of transducers. Thus, all the engineering students must be in acquaintance with these instruments. In this chapter, we shall focus our attention on construction and working principles of some of the important electrical instruments such as ammeter, voltmeter, wattmeter, and energy meter.