题目内容

The energy required to move a unit charge through an element is .

A. . current
B. . power
C. . voltage
D. . potential

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The plus (+) and minus (-) signs in an electric circuit diagram are used to define .

A. . voltage polarity
B. . current direction
C. . power flow
D. . absorbed power

According to the passive sign convention, if the power has a plus sign, power is by the element.

A. supplied
B. absorbed
C. generated
D. transferred

Is current in any electric circuit always a constant-valued function? Why?

How does current change when the time rate of charges is greater?