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

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

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Electronic Principles
For a pure capacitor:

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

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