Electronic Principles
For a pure capacitor:

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

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Electronic Principles
Which one of the following statements best describes magnetic hysteresis?

Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
Hysteresis is most apparent when the core material is saturated
None of these
Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet

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Electronic Principles
The total capacitance of a series capacitor circuit is:

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

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Electronic Principles
Which one of the following is a direct statement of Ohm's law?

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

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