Electronic Principles
Which one of the following equations most directly leads to the resistance of an ordinary household light bulb, assuming that you know the power and voltage rating?

R = E2/P
I = P/E
None of these
P = E2/R
P = PR

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Electronic Principles
The core of an electromagnet is said to be in saturation when:

the core is permitted to move freely within the coil
frequent changes in the direction of current through the coil causes heating effects in the core material
changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
None of these
an increase in current through the coil causes no further increase in the mmf

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Electronic Principles
For a pure capacitor:

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

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