Final answer:
The current in the 3.0-ohm resistor is 2.0 A.
Step-by-step explanation:
To determine the current in the 3.0-ohm resistor, we can use Ohm's law. Ohm's law states that the current flowing through a resistor is equal to the voltage across the resistor divided by the resistance. In this case, the voltage across the resistor is 6.0 volts, and the resistance is 3.0 ohms. Therefore, the current in the 3.0-ohm resistor is 2.0 amperes (A).