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CHAPTER 1
CIRCUIT MEASUREMENT
LEARNING OBJECTIVES
Learning objectives are stated at the beginning of each chapter. These learning objectives serve as a
preview of the information you are expected to learn in the chapter. The comprehensive check questions
are based on the objectives. By successfully completing the NRTC, you indicate that you have met the
objectives and have learned the information. The learning objectives are listed below.
Upon completion of this chapter you will be able to:
1. State two ways circuit measurement is used, why in-circuit meters are used, and one advantage of
out-of-circuit meters.
2. State the way in which a compass reacts to a conducting wire including the compass reaction to
increasing and decreasing dc and ac high and low frequencies.
3. State how a d’Arsonval meter movement reacts to dc.
4. State the purpose of a rectifier as used in ac meters.
5. State the meaning of the term "damping" as it applies to meter movements and describe two
methods by which damping is accomplished.
6. Identify average value as the value of ac measured and effective value (rms) as the ac value
indicated on ac meter scales.
7. Identify three meter movements that measure dc or ac without the use of a rectifier.
8. State the electrical quantity measured by an ammeter, the way in which an ammeter is connected
in a circuit, and the effect of an ammeter upon a circuit.
9. Define ammeter sensitivity.
10. State the method used to allow an ammeter to measure different ranges and the reason for using
the highest range when connecting an ammeter to a circuit.
11. List the safety precautions for ammeter use.
12. State the electrical quantity measured by a voltmeter, the way in which a voltmeter is connected
in a circuit, the way in which a voltmeter affects the circuit being measured, and the way in which
a voltmeter is made from a current reacting meter movement.
13. Define voltmeter sensitivity.
14. State the method used to allow a voltmeter to measure different ranges and the reason for using
the highest range when connecting a voltmeter to a circuit.
