PROBLEM: • The following figures were obtained from tests on a 30-kVA, 3000/110-V transformer: Open Circuit test: 3000V ; 0.5A : 350W; Short Circuit test: 150V ; 10A ; 500W Calculate the efficiency of the transformer at (a) full-load, 0.8 p.f. (b) half-load, unity p.f. (c) calculate the kVA output at which the efficiency is maximum.

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Electrical Heating Unit

The conversion of electrical energy to heat energy is known as electric heating. The heating system that converts the electrical energy to heat energy for various application is called electrical heating unit. Electricity is employed as the firing mechanism in electric heating systems, which transforms electric current to heat. Electric heaters have heating elements in the form of electric resistors.