If a circuit has a current of 2 A through a 3 Ω resistor, what is the voltage across that resistor?

If a circuit has a current of 2 A through a 3 Ω resistor, what is the voltage across that resistor?

• A. 3 V
• B. 6 V
• C. 2 V
• D. 9 V

Answer: (B)

Voltage across a resistor is found using Ohm's law: V = I × R. With a current of 2 A through a 3 Ω resistor, multiply 2 by 3 to get 6 volts. The units also line up, since A × Ω equals V. So the voltage across the resistor is 6 V. The other numbers would require a different current or resistance, so they don’t match these given values.

Voltage across a resistor is found using Ohm's law: V = I × R. With a current of 2 A through a 3 Ω resistor, multiply 2 by 3 to get 6 volts. The units also line up, since A × Ω equals V. So the voltage across the resistor is 6 V. The other numbers would require a different current or resistance, so they don’t match these given values.