The unit used to measure resistance is the ohm.

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Multiple Choice

The unit used to measure resistance is the ohm.

Explanation:
Identifying the unit for electrical resistance. Resistance measures how much a component or wire opposes current flow. The unit used for that opposition is the ohm, symbolized by the Greek letter omega. From Ohm’s law, resistance equals voltage divided by current, so its unit is volt per ampere. Since a volt is energy per unit charge and an ampere is charge per second, volt per ampere defines the ohm. The other options measure different quantities: joule is energy, coulomb is electric charge, and watt is power. So the ohm is the correct unit.

Identifying the unit for electrical resistance. Resistance measures how much a component or wire opposes current flow. The unit used for that opposition is the ohm, symbolized by the Greek letter omega. From Ohm’s law, resistance equals voltage divided by current, so its unit is volt per ampere. Since a volt is energy per unit charge and an ampere is charge per second, volt per ampere defines the ohm. The other options measure different quantities: joule is energy, coulomb is electric charge, and watt is power. So the ohm is the correct unit.

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