Electronic Principles
Which one of the following equations most directly determines the power dissipation of a resistance when you know the power dissipation of a resistance when you know the voltage drop and current?

None of these
P = I2R
I = P/E
P = IE
P = E2/R

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Electronic Principles
Doubling the operating frequency of a purely inductive circuit:

increases the current, but by an amount that can be determined only by doing a complete analysis of the circuit
cuts the current through the inductors one-half
None of these
doubles the amount of current through the inductors
has no effect on the current through the inductors

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Electronic Principles
Which one of the following statements best describes magnetic hysteresis?

Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
Hysteresis is most apparent when the core material is saturated
None of these
Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet

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Electronic Principles
Which one of the following statements most accurately applies to the frequency of a waveform?

Unless specified otherwise, the frequency of a waveform is assumed to be 60 Hz
The higher the amplitude of a waveform, the higher its frequency
None of these
The actual frequency of a sine waveform is 1.41 times the working frequency
The longer the period of a waveform, the lower its frequency

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