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?

200 mA
7.8 mA
208 mA
None of these
300 mA

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Electronic Principles
When a parallel RLC circuit is operating at its resonant frequency:

None of these
capacitive reactance is greater than the inductive reactance
the difference between inductive and capacitive reactance is equal to the resistance
inductive reactance is greater than the capacitive reactance
inductive reactance is equal to the capacitive reactance

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Electronic Principles
The total inductive reactance of a parallel inductor circuit is:

equal to the sum of the individual inductance values
equal to the sum of the individual inductive-reactance values
None of these
less than the inductance value of the smallest inductor
equal to the source voltage divided by total current

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Electronic Principles
Which one of the following is a statement of Kirchhoffs current law?

None of these
The total current in a parallel circuit is less than the value of the smallest current
The algebraic sum of currents entering and leaving a point is equal to zero
The current through a resistance is proportional to the value of resistance and the IR drop across it
The algebraic sum of currents in a loop is equal to zero

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