alleryStart learning →The product of current and resistance for a resistor is commonly given which name?
AThe IR gain across it
BThe IR drop across it
CThe IR power in it
DThe IR charge on it
Answer & Solution
Correct answer: B. The IR drop across it
1. Solving I = V / R for voltage gives V = I R.
2. That voltage is the drop across the resistor produced by the current flowing through it.
3. Engineers call it the IR drop, and it is measured in volts.
4. Calling it a gain reverses the sense, since voltage rises at the battery and falls at the resistor.
_Source: OpenStax College Physics (CC BY 4.0), Ch 20 "Electric Current, Resistance, and Ohm's Law", section Resistance and Simple Circuits_
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