In a DC circuit with a 6 V source and a 2 Ω resistor, what is the current?

In a DC circuit with a 6 V source and a 2 Ω resistor, what is the current?

• A. 0.5 A
• B. 6 A
• C. 3 A
• D. 12 A

Answer: (C)

Current in a DC circuit is determined by Ohm’s law: I = V / R. With a 6-volt source across a 2-ohm resistor, the current is 6 ÷ 2 = 3 amperes. So 3 A flows through the circuit. The driving voltage pushes charges through resistance, and changing the resistance or the voltage would change the current accordingly (for example, 6 V across 1 Ω gives 6 A, while 6 V across 12 Ω gives 0.5 A). In this simple loop, the current is the same everywhere along the path, and it flows from the positive to the negative terminal.

Current in a DC circuit is determined by Ohm’s law: I = V / R. With a 6-volt source across a 2-ohm resistor, the current is 6 ÷ 2 = 3 amperes. So 3 A flows through the circuit. The driving voltage pushes charges through resistance, and changing the resistance or the voltage would change the current accordingly (for example, 6 V across 1 Ω gives 6 A, while 6 V across 12 Ω gives 0.5 A). In this simple loop, the current is the same everywhere along the path, and it flows from the positive to the negative terminal.