The problems for Classifying Equipment with respect to various characteristics of transformation and of converters which form part of electrical measuring instruments, reveal the extent of diversity in the design of modern measuring instruments. It should also be noted that all the reasoning refers only to so-called "measuring" transducers which affect directly the properties and characteristics of instruments. In addition to the measuring converters, modern instruments also comprise supplementary converters, for instance, in the supply circuit, which function as rectifiers, stabilizers of the supply voltage, etc, thus still further complicating the design of the instrument.Hence, it is simply impossible to classify the electrical measuring instruments by their design, or by any single characteristic which determines the design of the instrument and its properties.

"Electrical science has disclosed to us the more intimate relation existing between widely different forces and phenomena and has thus led us to a more complete comprehension of Nature and its many manifestations to our senses." - Nikola Tesla

Electrical measurements are the methods, devices and calculations used to measure electrical quantities. Measurement of electrical quantities may be done to measure electrical parameters of a system. Using transducers, physical properties such as temperature, pressure, flow, force, and many others can be converted into electrical signals, which can then be conveniently measured and recorded. High-precision laboratory measurements of electrical quantities are used in experiments to determine fundamental physical properties such as the charge of the electron or the speed of light, and in the definition of the units for electrical measurements, with precision in some cases on the order of a few parts per million. Less precise measurements are required every day in industrial practice. Electrical measurements are a branch of the science of metrology.

From the large number of criteria that take into account the physical and technical nature of analog electrical measuring instruments, three have been singled out in the proposed classification which define the purpose, the metrological features (method of realizing the measuring process), and the technological features (nature of the major subassemblies). All analog instruments can be classified in accord with these criteria regardless of their structure, complexity of the equipment, and operating principles of the measuring transducer.

E-waste production in great amounts and its problems, which challenge the field of Waste and Environment Management, stem from the increase in the production of electronic appliances, diversity-seeking consumers, and perishable products. To solve the problems and extract valuable metals by Hydrometallurgy Equipment, leaching and organic solvent are used. To do this, after a specific amount of electrical and electronic waste was crushed, ground, and refined, it was sampled. Then, the sample was washed with water, and its remaining was leached into nitric acid. As a result, copper and silver were dissolved in it, and considering chemical features, gold remained in solid objects.

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