In electrical engineering, resistance is measured in which unit?

Introduction / Context:
Basic electrical quantities include voltage, current, resistance, and power. Each has a standard SI unit. Recognizing which belongs to which is fundamental in circuit analysis and physics.

Given Data / Assumptions:

• Resistance is defined as the opposition to current flow.
• We need to identify its unit of measure.

Concept / Approach:

By Ohm's Law, V = I * R. Rearranging, R = V / I. Voltage is measured in volts (V), current in amperes (A), so resistance must be volts per ampere. This unit is named after Georg Simon Ohm and denoted 'ohm' (Ω).

Step-by-Step Solution:

Verification / Alternative check:

Multimeters show resistance ranges with 'Ω' as the unit symbol. Engineering handbooks confirm the same.

Why Other Options Are Wrong:

• Volts: measure electric potential difference, not resistance.
• Amps: measure electric current.
• Watts: measure power (V * I), not resistance.
• None: incorrect because ohms is correct.

Common Pitfalls:

• Confusing ohms with watts; both appear in electrical contexts but measure different properties.

Final Answer:

Ohms.