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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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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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AC Potentiometer An AC potentiometer basically works on the same principle as a DC potentiometer. However, there is one very important difference between the two. In DC potentiometer, only the …
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DC Potentiometer DC potentiometer is used for measuring and comparing the e.m.fs. of different cells and for calibrating and standardizing voltmeters, ammeters etc. In its simplest from, it consists of …
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Electrodynamic Power Factor Meter Working Principle of Electrodynamic Power Factor Meter The Electrodynamic Power Factor Meter is based on the dynamometer principle with spring control removed. Figure A Construction of …
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