Basic measurement identification: In electrical engineering, voltage (electric potential difference) is measured in which SI unit?

Introduction / Context:
Voltage, current, resistance, capacitance, and power each have distinct SI units. Recognizing them prevents specification and calculation errors throughout circuit work and instrumentation.

Given Data / Assumptions:

• Quantity: voltage (potential difference).
• Symbols and units: V (volt), A (ampere), Ω (ohm), F (farad), W (watt).

Concept / Approach:
Voltage is the energy per unit charge difference between two points. The SI unit is the volt (V), equal to one joule per coulomb. Other options correspond to different quantities and therefore are distractors.

Step-by-Step Solution:

Verification / Alternative check:
From Ohm’s law V = I * R, the unit V is consistent with A * Ω. From power P = V * I, volts also equal watts per ampere, again reinforcing correct unit identity.

Why Other Options Are Wrong:

• farads: unit of capacitance.
• watts: unit of power.
• ohms: unit of resistance.

Common Pitfalls:

• Confusing V (volt) with W (watt) when scanning quickly.
• Using 'voltage' and 'power' interchangeably—these are different physical quantities.

Final Answer:
volts