Electronic Principles
Which one of the following equations most directly determines the power dissipation of a resistance when you know the voltage drop and amount of resistance?

I = P/E
None of these
P = IE
P = I2R
P = E2/R

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Electronic Principles
Voltage is

The number of free electrons in an atom
Trie force that causes electrons to flow
None of these
The smallest electrically charged particle
The flow of charged particles through a material

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

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

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