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AC Through Pure Inductance Alone Whenever an alternating voltage is applied to a purely inductive coil (AC Through Pure Inductance Alone), a back e.m.f. is produced due to the self-inductance …
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AC Through Pure Ohmic Resistance Alone The circuit is shown in Figure (A) is explaining AC Through Pure Ohmic Resistance Alone. Let the applied voltage be given by the equation. v …
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Representation of Alternating Quantities Representation of Alternating Quantities It has already been pointed out that an attempt is made to obtain alternating voltages and currents having sine waveform (Representation of …
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RMS Value of a Complex Wave In the case of RMS Value of a Complex Wave also, either the mid-ordinate method (when equation of the wave is not known) or …
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Phase and Phase Difference Phase and Phase Difference : By phase of an alternating current is meant the fraction of the time period of that alternating current which has elapsed …
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What Is Frequency What is Frequency – The number of cycles/second is called the frequency of the alternating quantity. Its unit is hertz (Hz). In the simple 2-pole alternator one cycle …
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Potential Transformers Potential transformers are extremely accurate-ratio stepdown transformers and are used in conjunction with standard low-range voltmeters (100-120 V) whose deflection when divided by transformation ratio, gives the true …
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Current Transformer A current transformer takes the place of shunt in d.c. measurements and enables heavy alternating current to be measured with the help of a standard 5-A range a.c. …
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Ratio and Phase Angle Errors of Instrument Transformers For satisfactory and accurate performance, it is necessary that the ratio of transformation of the instrument transformer should be constant within close …
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Instrument Transformers The d.c. circuits when large currents are to be measured, it is usual to use low-range ammeters with suitable shunts. For measuring high voltages, low-range voltmeters are used …
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