Electronic Principles
Current is

The flow of charged particles through a material
The number of free electrons in an atom
The force that causes electrons to flow
None of these
An imbalance of electrical charges

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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 repel, while unlike poles attract
Like magnetic poles attract, while unlike poles repel
None of these
Current flowing through a conductor generates a magnetic field

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

The total voltages is less than the sum of the voltages across the resistance and inductance
The total voltage is equal to the sum of the voltages across the resistance and inductance
None of these
The total voltage lags the total current by less than 90
The voltage always has the same amplitude and phase for every part of the circuit

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