ADM 109 - UNIT 16
What is the average voltage of a full-wave rectified 240 V RMS AC voltage?
216.17 V
What is the RMS value of an AC voltage that has a 480 V peak?
339.46 V
What is the peak voltage of a 277 V RMS AC voltage?
391.68 V
_____ is the square root of the mean of the square of the instantaneous currents.
RMS
A triangle wave is waveform in which voltage rises at a constant rate with respect to time.
True
If an AC waveform is rectified and converted into DC, the voltage value that results is the _____ value.
average
Each complete waveform of 360° is called a _____.
cycle
A term used to indicate the same value as the RMS value is the _____ value.
effective
The number of cycles completed in one second is called a _____.
frequency
The unit of frequency is _____.
hertz
When current rises and falls at the same rate as the voltage and reverses the direction of flow when the voltage reverses polarity, the current is said to be _____ with the voltage.
in phase
A(n) _____ load contains pure resistance.
resistive
When AC voltage is rectified and converted into DC, the resulting waveform is normally not pure, flat DC. The pulses that occur are called _____.
ripples
Rotating machines normally produce a waveform called a _____ wave.
sine
The most common of all AC waveforms is the _____ wave.
sine
The_____ effect occurs when AC induces eddy currents into the conductor, which cause the electrons to be repelled toward the outer surface of the conductor.
skin
To help overcome the problem of skin effect in high-frequency circuits, conductors with a large amount of _______________ must be used.
surface area
In a DC circuit, the product of volts times the amperes is called _____ power.
true
The unit of measure of the power delivered to the load in a DC circuit is _____.
watts
The amplitude of a waveform is measured from _____.
zero to the highest value obtained in either direction
A wave in which the voltage rises at a constant rate with respect to time is a _____ wave.
linear
Square waves are generally produced by electronic devices called _____.
oscillators
The maximum point of a waveform is called the _____.
peak