In figure of "A" of the illustrated circuit, what is the voltage measured across R1 if the battery voltage is 24 volts, the resistance of R1 is 34 ohms, and the resistance of R2 is 126 ohms when the switch is closed? Illustration EL-0020

Correct Answer: Option C — 5.1 volts

Voltage drop across a specific series resistor is found using the voltage divider rule ($V_{R1} = V_{total} \times \frac{R_1}{R_1 + R_2}$). For 24 volts across 34 and 126 ohms, R1 drops 5.1 volts, ensuring compliance with 46 CFR Subchapter J voltage drop limits.