Electronic Principles
A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?

200 mA
7.8 mA
208 mA
300 mA
None of these

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Electronic Principles
The south pole of a magnet is the one:

that would be attracted to the earth's south magnetic pole
that would be attracted to the earths north magnetic pole
that has its molecules arranged in a random pattern
None of these
that would be repelled by the north pole of another magnet

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