Electronic Principles
Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?

The voltage remains at one polarity and at a steady level
The voltage causes current to flow in two directions at the same time
The voltage remains at one polarity but changes value periodically
The voltage reverses polarity periodically
None of these

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Electronic Principles
What is a free electron?

An electron that has no electrical charge
An electron that has been freed from its parent atom
An electron that has twice the amount of charge of a normal electron
None of these
An electron that costs nothing

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Electronic Principles
Which one of the following is a statement of KirchhofFs voltage law?

The algebraic sum of voltages in a loop is equal to zero
None of these
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 voltages entering and leaving a point is equal to zero
The total voltage in a parallel circuit is less than the value of the smallest voltage

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