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?

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

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Electronic Principles
In a pure inductor:

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

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Electronic Principles
Which one of the following statements is true for the currents in a parallel RL circuit?

The total current is less than the sum of the currents through the resistance and inductance
None of these
The current always has the same amplitude and phase for every part of the circuit
The total current is equal to the sum of the currents through the resistance and inductance
The total current leads the total voltage by less than 90

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

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

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