Abstract
Publisher Summary This chapter discusses the single-phase alternating current theory. With parallel circuits, the supply voltage is common to each part of the network. All the loads on an electrical distribution system are normally in parallel with each other. The practical coil has winding resistance, and if the coil has a core of iron or other magnetic material, additional losses occur in the core. These are known as iron losses. Such a coil is known as a choke, a choking coil, or an iron-cored reactor. It may be represented by two resistors and a pure inductor connected in series. To determine the equivalent circuit of an iron-cored coil at a particular voltage and frequency, it should be connected to such an alternate-current supply and the supply voltage. The resistance of the coil can be measured by using a commercial resistance measuring instrument or by connecting the coil to a low-voltage direct current supply and noting the voltage across the coil and the current through it.
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