If a circuit has a voltage difference of 12 V and a resistance of 3 ohms, what is the current according to Ohm's Law?

If a circuit has a voltage difference of 12 V and a resistance of 3 ohms, what is the current according to Ohm's Law?

• A. 3 A
• B. 4 A
• C. 6 A
• D. 2 A

Answer: (B)

Ohm's Law is at play here: current equals voltage divided by resistance. With 12 volts across 3 ohms, the current is 12 ÷ 3 = 4 amperes. This aligns with the fact that current scales with voltage when resistance stays the same. If you try the other currents—3 A would require 9 V, 6 A would require 18 V, and 2 A would require 6 V—so the given 12 V across 3 Ω indeed yields 4 A.

Ohm's Law is at play here: current equals voltage divided by resistance. With 12 volts across 3 ohms, the current is 12 ÷ 3 = 4 amperes. This aligns with the fact that current scales with voltage when resistance stays the same. If you try the other currents—3 A would require 9 V, 6 A would require 18 V, and 2 A would require 6 V—so the given 12 V across 3 Ω indeed yields 4 A.