Which unit is used to measure resistance?

Which unit is used to measure resistance?

• A. amperes
• B. watts
• C. volts
• D. ohms

Answer: (D)

Resistance is measured in the ohm. The ohm (symbol Ω) is defined as one volt per ampere, so if one volt drives one ampere through a component, its resistance is one ohm. This unit specifically describes how much a component resists current flow. The other units represent different quantities: amperes measure current (the flow of charge), volts measure voltage (the electrical pressure pushing the current), and watts measure power (the rate at which energy is used or produced). The relationship V = I × R ties these together, making the ohm the specific unit for resistance.

Resistance is measured in the ohm. The ohm (symbol Ω) is defined as one volt per ampere, so if one volt drives one ampere through a component, its resistance is one ohm. This unit specifically describes how much a component resists current flow.

The other units represent different quantities: amperes measure current (the flow of charge), volts measure voltage (the electrical pressure pushing the current), and watts measure power (the rate at which energy is used or produced). The relationship V = I × R ties these together, making the ohm the specific unit for resistance.