Deck 2: Alternating-Current Circuits Containing Resistance

Question 1

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

Answer 1

True

Question 2

Give an explanation of the term impedance.

Answer 2

The term impedance is generally used to describe the total current limiting effect in alternating current circuits. Impedance is a combination of all current limiting properties such as resistance, inductance, and capacitance.

Question 3

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

Answer 3

False

Question 4

What is the root-mean-square current?

Question 5

Discuss the effective value of alternating current.

Question 6

____________________'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.

Question 7

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

Question 8

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

Question 9

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

Question 10

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

Question 11

Why are silicon rectifiers used in meters?

Question 12

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

Question 13

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

Question 14

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.

Question 15

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 ____________________.