Electronic Principles
Current is

The force that causes electrons to flow
The number of free electrons in an atom
The flow of charged particles through a material
An imbalance of electrical charges
None of these

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Electronic Principles
The total impedance of a parallel RLC circuit:

always decreases as the applied frequency increases
always increases as the applied frequency increases
is maximum at the resonant frequency
is equal to the sum of the values of resistance, inductive reactance and capacitive reactance
None of these

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

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