What will be the total current in figure "B" of the illustrated circuit with the switch closed if the applied voltage is 24 volts and the resistance of R1 is 3 ohms, R2 is 4 ohms, and R3 is 5 ohms, respectively? EL-0020

Correct Answer: Option A — 2 amps

Total series circuit resistance equals 12 ohms ($3 + 4 + 5$). Applying Ohm's law, total current equals applied voltage divided by total resistance ($24 / 12$), resulting in 2 amperes. IEEE 45 standards require verifying these values for protective device coordination.