In a resistor circuit with R = 4 Ω and current I = 2 A, what is the voltage across the resistor?

In a resistor circuit with R = 4 Ω and current I = 2 A, what is the voltage across the resistor?

• A. 16 V
• B. 4 V
• C. 8 V
• D. 2 V

Answer: (C)

Voltage across a resistor follows Ohm’s law: V = I × R. This means the voltage drop across the resistor equals the current through it multiplied by its resistance. With a current of 2 A flowing through a 4 Ω resistor, the voltage is V = 2 × 4 = 8 volts. The units line up correctly: amperes times ohms yield volts. Remember, knowing any two of V, I, and R lets you find the third. The given values only fit when you multiply 2 A by 4 Ω, giving 8 V.

Voltage across a resistor follows Ohm’s law: V = I × R. This means the voltage drop across the resistor equals the current through it multiplied by its resistance. With a current of 2 A flowing through a 4 Ω resistor, the voltage is V = 2 × 4 = 8 volts. The units line up correctly: amperes times ohms yield volts. Remember, knowing any two of V, I, and R lets you find the third. The given values only fit when you multiply 2 A by 4 Ω, giving 8 V.