In a DC circuit with V = 120 V and R = 24 Ω, what is the current I?

• A. 0.5 A
• B. 1 A
• C. 5 A
• D. 10 A

Answer: (C)

In a DC circuit, current is found using Ohm’s law: I = V / R. With V = 120 V and R = 24 Ω, the current is 120 / 24 = 5 amperes. This makes sense because a larger voltage across the same resistance pushes more current, and 5 A is the value that satisfies the given voltage across 24 Ω. Quick checks: if the current were 0.5 A, the voltage would be 0.5 × 24 = 12 V; if 1 A, it would be 24 V; if 10 A, it would be 240 V—only 5 A matches 120 V.