Which of the following is NOT an application of Ohm's law?

• A. Computing the equivalent resistance of two resistors in parallel using $\frac{1}{R_e}=\frac{1}{R_1}+\frac{1}{R_2}$
• B. Determining the voltage drop across a resistor using $V=IR$ when current and resistance are known
• C. Finding resistance from measurements using $R=\frac{V}{I}$ for an ohmic device
• D. Calculating current using $I=\frac{V}{R}$ for a resistor with known voltage and resistance

Answer: (A)