Electronic Principles
A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?

300 mA
7.8 mA
200 mA
208 mA
None of these

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Electronic Principles
The total capacitive reactance of a parallel capacitor circuit is:

equal to the source voltage divided by total current
less than the capacitance value of the smallest capacitor
None of these
equal to the sum of the individual capacitive-reactance values
equal to the sum of the individual capacitance values

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Electronic Principles
The rms value of a sine waveform is:

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

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