Electronic Principles
Which one of the following equations most directly leads to the resistance of an ordinary household light bulb, assuming that you know the power and voltage rating?

P = PR
None of these
I = P/E
R = E2/P
P = E2/R

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Electronic Principles
In a pure inductor:

ac current leads the voltage by 90 degree
ac current and voltage are exactly in phase
None of these
ac current is converted to dc voltage
ac current lags the voltage by 90 degree

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Electronic Principles
Waveforms are graphs that show:

amplitude on the vertical axis and frequency on the horizontal axis
None of these
frequency on the vertical axis and amplitude on the horizontal axis
amplitude on the vertical axis and the passage of time on the horizontal axis
the passage of time on the vertical axis and amplitude on the horizontal axis

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