When the flux linking with a coil (or conductor) changes, an EMF is induced in the coil. This EMF can be induced by the following two ways: Self Induced EMF The EMF induced in a coil due to change of flux produced by it linking with its own turns is known as self-induced EMF. Consider […]
A closed path followed by magnetic flux is known as a magnetic circuit. In a magnetic circuit, flux starts from one point and finishes at the same point. A magnetic circuit usually consists of magnetic materials having high permeability such as iron, soft steel, etc. since they offer small opposition to magnetic flux. The magnetic
In DC circuits, the product VI gives the power in watts drawn by the circuit. But in AC circuits, things are different. In AC circuits, the product VI gives the apparent power and not the real power because the voltage and current are not in phase with each other. Power Factor in AC Circuit The
In actual practice, AC circuits contain two or more than two components connected in series. In a series circuit, each component carries the same current. An AC series circuit may be classified as under: RL Series Circuit In an RL series circuit, a pure resistance (R) is connected in series with a coil having the
All AC circuits are made up of the combination of resistance R, inductance L and capacitance C. The circuit elements R, L, and C are known as circuit parameters. To study a general AC circuit it is necessary to consider the effect of each parameter separately. Purely Resistive Circuit A purely resistive circuit is a
In a DC system, the voltage and current are constant, therefore, there is no problem in specifying their magnitude. But in the case of an AC system, an alternating voltage varies from instant to instant and so poses a problem in specifying the magnitude. So to express the AC quantities in an easy and understandable form,
Dielectric heating is also known as radio frequency heating or electronic heating. When a non-metallic material such as wood, plastic, bone, or ceramic is subjected to an alternating electrostatic field, the dielectric loss occurs in it. This loss appears in the form of heat in dielectric heating. It is the basic dielectric heating principle. A
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In the electric arc furnace, the heat is generated by an electric arc. In this furnace, the arc may be created by the following different ways: 1. By striking the arc between the charge and electrode: In this method, the heat is directly conducted and taken by the charge. The furnace operating on this principle
The induction heating works on the transformer principle. It is also known as eddy current heating. In these machines, the currents are induced by the principle of electromagnetic induction. It may be of low frequency as in the case of core type induction furnaces or of high frequency as in the case of coreless induction
The basic principle of resistance heating is that, when current passes through some resistance, power loss takes place which appears in the form of heat. There are two types of resistance heating, namely, direct resistance heating and indirect resistance heating. Direct Resistance Heating In the direct resistance heating, the electric current passes through the charge