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

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Electronic Principles
The rms value of a sine waveform is:

None of these
equal to 0.707 times the peak amplitude
equal to 1.41 times the peak amplitude
the time required to complete one full cycle
the number of cycles completed in one second

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Electronic Principles
A low-pass filter:

has no effect on ac signals
reduces the level of all frequencies by a significant amount
passes higher-frequency signals and reduces lower-frequency signals
passes lower-frequency signals and reduces higher-frequency signals
None of these

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