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COMPASS AND ALTERNATING CURRENT
DAMPING - 14175_24

Neets Module 03-Introduction to Circuit Protection, Control, and Measurement
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1-11 RECTIFIER FOR AC MEASUREMENT A rectifier is a device that changes alternating current to a form of direct current. The way in which this is done will be covered later in this training series. For now, it is necessary to know only the information presented in figure 1-12. Figure 1-12.—Rectifier action. Figure 1-12 shows that an alternating current passed through a rectifier will come out as a "pulsating direct current." What happens to the compass now? Figure 1-13 answers that question. Figure 1-13.—Compass and conductor; rectified ac. When the compass is placed close to the wire and the frequency of the alternating current is high enough, the compass will vibrate around a point that represents the average value of the pulsating direct current, as shown in figure 1-13. Q10.    How would a compass react when placed close to a conductor carrying alternating current at a low frequency? Q11.    How would the compass react if the alternating current through the conductor was a high frequency? Q12.    What is the purpose of a rectifier in a meter?






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