If one resistor opens in the 24-volt parallel circuit with two 24-ohm resistors, what is the current from the source?

If one resistor opens in the 24-volt parallel circuit with two 24-ohm resistors, what is the current from the source?

• A. 2 A
• B. 0.5 A
• C. 1 A
• D. 24 A

Answer: (C)

In a parallel circuit, the full supply voltage appears across each branch, and currents in branches add up to the source current. If one branch opens, no current flows through that branch, so the source current comes only from the remaining branch. With 24 V across the surviving 24-ohm resistor, the current through that path is I = V/R = 24 V / 24 Ω = 1 A. Therefore, the current from the source is 1 A. If both resistors were connected, the total would be 2 A, but with one open, it drops to 1 A.

In a parallel circuit, the full supply voltage appears across each branch, and currents in branches add up to the source current. If one branch opens, no current flows through that branch, so the source current comes only from the remaining branch.

With 24 V across the surviving 24-ohm resistor, the current through that path is I = V/R = 24 V / 24 Ω = 1 A. Therefore, the current from the source is 1 A. If both resistors were connected, the total would be 2 A, but with one open, it drops to 1 A.