To determine the polarity of the voltage drop across a resistor, it is necessary to know___________?
Correct answer: B. direction of current through the resistor
- A. value of current through the resistor
- B. direction of current through the resistor
- C. value of resistor
- D. e.m.fs. in the circuit
Explanation
Using the passive sign convention, current enters the positive terminal of a resistor, so the current direction identifies the voltage-drop polarity. The current magnitude, resistance value, and EMFs are not required merely to determine polarity.
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