What is the unit for resistance?

What is the unit for resistance?

• A. Volts
• B. Joules
• C. Ohms
• D. Amps

Answer: (C)

Resistance is how strongly a component opposes current flow. The unit for resistance is the ohm, symbolized by the Greek letter omega (Ω). This follows Ohm's law, V = I × R, so R = V / I. From that, one ohm equals one volt per ampere. Volts measure electrical potential difference, amps measure current, and joules measure energy—none of these directly quantify opposition to current like the ohm does. So the correct unit for resistance is ohms. Example: a component with 2 ohms resistance and 1 amp current has 2 volts across it.

Resistance is how strongly a component opposes current flow. The unit for resistance is the ohm, symbolized by the Greek letter omega (Ω). This follows Ohm's law, V = I × R, so R = V / I. From that, one ohm equals one volt per ampere. Volts measure electrical potential difference, amps measure current, and joules measure energy—none of these directly quantify opposition to current like the ohm does. So the correct unit for resistance is ohms. Example: a component with 2 ohms resistance and 1 amp current has 2 volts across it.