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

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

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

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

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