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

100 W
20 W
200 W
None of these
1000 W

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Electronic Principles
Which one of the following principles best describes the basic operation of an electromagnet?

Current is induced in a conductor that is moving through a magnetic field
Like magnetic poles attract, while unlike poles repel
None of these
Current flowing through a conductor generates a magnetic field
Like magnetic poles repel, while unlike poles attract

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Electronic Principles
Which one of the following statements is true for current flowing in a parallel circuit?

The amount of current flow through each branch of a parallel circuit can be different, depending on the resistance of each branch part and the amount of voltage applied to it
The same current always flows through every part of a parallel circuit
None of these
The total current in a parallel circuit is equal to the total voltage multiplied by the total resistance
The total current in a parallel circuit is always less than the smallest amount of current

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

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

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