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Exam 2: Alternating-Current Circuits Containing Resistance

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Question 1

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Why are silicon rectifiers used in meters?

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In general, silicon rectifiers are used ...

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Question 2

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Why is it necessary to determine the peak value if a solid state component is to be connected to an ac circuit?

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If a solid state component is to be connected into an ac circuit, it is generally necessary to determine the peak value to make certain the component will not be damaged.

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A device called a(n) ____________________ is used to measure the area of the alternation between the wave and the zero reference line.

____________________'s law states that the current in a resistor is directly proportional to the voltage and inversely proportional to the magnitude of the resistance of the circuit.

The RMS value of current is the current indicated by the typical ____________________.

The voltage ratings of solid state devices are given as PIV (peak inverse voltage) or PRV (peak reverse voltage).

What is the root-mean-square current?

When the current and the voltage waveforms of a circuit are zero at the same time and reach their maximum values at the same time and in the same direction, these waves are said to be in ____________________.

Some manufacturers of dc instruments modify the circuit connections and the scale calibrations to measure ac voltages and currents.

Give an explanation of the term impedance.

____________________ instruments have uniform scale graduations and markings for the entire scale range.

The product of effective volts and effective amperes is less than the power in watts in any ac circuit having a noninductive resistance load where the current and the voltage are in phase.

Discuss the effective value of alternating current.

The dc voltmeter has a d'Arsonval movement, which operates on the same principle as a dc motor.

Full-wave rectifiers eliminate one half of the waveform and retain the other.