AC by Tony R. Kuphaldt PDF

By Tony R. Kuphaldt

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REVIEW: • Phase shift is where two or more waveforms are out of step with each other. • The amount of phase shift between two waves can be expressed in terms of degrees, as defined by the degree units on the horizontal axis of the waveform graph used in plotting the trigonometric sine function. • A leading waveform is defined as one waveform that is ahead of another in its evolution. A lagging waveform is one that is behind another. Example: Phase shift = 90 degrees A B A leads B; B lags A • • Calculations for AC circuit analysis must take into consideration both amplitude and phase shift of voltage and current waveforms to be completely accurate.

V V A V A V A A OFF A OFF COM 6V A COM 6V The mathematical sign of a digital DC voltmeter’s display has meaning only in the context of its test lead connections. Consider the use of a DC voltmeter in determining whether or not two DC voltage sources are aiding or opposing each other, assuming that both sources are unlabeled as to their polarities. Using the voltmeter to measure across the first source: 44 CHAPTER 2. COMPLEX NUMBERS The meter tells us +24 volts V A A V OFF A COM Source 1 Source 2 Total voltage?

Conversely, when the current is negative (below the line), the voltage is also negative, which results in a positive value for power (a negative number multiplied by a negative number equals a positive number). This consistent ”polarity” of power tells us that the resistor is always dissipating power, taking it from the source and releasing it in the form of heat energy. Whether the current is positive or negative, a resistor still dissipates energy. 2 AC inductor circuits Inductors do not behave the same as resistors.

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AC by Tony R. Kuphaldt

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