In a circuit with a 10 Ω resistor and a current of 2 A, what is the voltage across the resistor?

In a circuit with a 10 Ω resistor and a current of 2 A, what is the voltage across the resistor?

• A. 40 V
• B. 12 V
• C. 20 V
• D. 2 V

Answer: (C)

Voltage across a resistor is found using Ohm’s law: V = I × R. With a current of 2 A flowing through a 10 Ω resistor, the voltage is V = 2 × 10 = 20 V. The other numbers would require a different current or resistance (for example, 40 V would need 4 A or a 20 Ω resistor, 12 V would need 1.2 A, or 2 V would need 0.2 A), but given the values provided, 20 V is the correct result.

Voltage across a resistor is found using Ohm’s law: V = I × R. With a current of 2 A flowing through a 10 Ω resistor, the voltage is V = 2 × 10 = 20 V. The other numbers would require a different current or resistance (for example, 40 V would need 4 A or a 20 Ω resistor, 12 V would need 1.2 A, or 2 V would need 0.2 A), but given the values provided, 20 V is the correct result.