Electronic Principles
Which one of the following equations most directly determines the power dissipation of a resistance when you know the power dissipation of a resistance when you know the voltage drop and current?

P = I2R
I = P/E
None of these
P = E2/R
P = IE

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

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

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