A series circuit contains a 6 Ω resistor and a 4 Ω resistor connected to a 24 V source. The current in the circuit is :

• A. 2.4 A
• B. 0.4 A
• C. 3.0 A
• D. 6.0 A

Answer: (A)

In a series circuit, the same current flows through every component, and the current is found by dividing the source voltage by the total resistance. Add the resistors: 6 Ω plus 4 Ω equals 10 Ω. With a 24 V source, the current is 24 V divided by 10 Ω, which is 2.4 A. This matches the given answer. The other currents would require different total resistances (0.4 A would need 60 Ω, 3.0 A would need 8 Ω, 6.0 A would need 4 Ω), which don’t fit the setup of the two resistors in series with the 24 V source.