alleryStart learning →OHM'S LAW states the relationship between voltage $V$, current $I$, and resistance $R$ as
A$V = I + R$
B$V = I/R$
C$V = I \cdot R$
D$V = I - R$
Answer & Solution
Correct answer: C. $V = I \cdot R$
1. Ohm's Law: voltage across a resistor equals current times resistance.
2. $V = IR$ — units: $V$ in volts, $I$ in amperes, $R$ in ohms.
3. Rearrangements: $I = V/R$, $R = V/I$.
4. Applies to LINEAR resistors at constant temperature. Real resistors deviate at high power (heating) or high frequency.
5. Other options have wrong dimensional relationships.
_Source: Tony Kuphaldt, "Lessons in Electric Circuits — DC", Vol I, Ch 2 (Ohm's Law)._
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