Electronic Principles
Assuming 100% efficiency, what is the power being applied to the primary winding of the transformer described in the above question?

None of these
200 W
100 W
20 W
1000 W

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

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

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