In a simple series circuit with a 6 V supply and total resistance 5 Ω, what is the current?

• A. 0.8 A
• B. 1.2 A
• C. 2.0 A
• D. 6.0 A

Answer: (B)

Current in a simple circuit is found using Ohm’s law: I = V / R. With a 6 V supply and a total resistance of 5 Ω, the current is 6 divided by 5, which equals 1.2 A. In a series circuit, the same current flows through every component, so this 1.2 A is what flows around the loop.

If you check the other options, they would require different total resistances: 0.8 A would need 7.5 Ω, 2.0 A would need 3 Ω, and 6.0 A would need 1 Ω. Since the total resistance here is fixed at 5 Ω, the only consistent current is 1.2 A.