Basic electrical units: Identify the SI base unit for electric current used in circuit analysis and measurements.

Introduction / Context:Electrical engineering relies on a small set of SI units. Recognizing which quantity each unit measures helps when interpreting datasheets and equations such as Ohm’s law and power relations.

Given Data / Assumptions:

• The question asks specifically for the SI base unit of electric current.
• Common electrical units: volt (V), watt (W), ohm (Ω), and ampere (A).
• We distinguish base vs derived units.

Concept / Approach:The ampere (A) is the SI base unit for electric current. By contrast, the volt is a derived unit (J/C), the ohm is derived (V/A), and the watt is derived (J/s = V*A). Thus, only “ampere” correctly answers the prompt.

Step-by-Step Solution:List candidates: volt, watt, ampere, ohm.Identify base vs derived: ampere is base; others are derived.Select “ampere.”

Verification / Alternative check:Ohm’s law I = V/R uses ampere directly for current. Power P = V * I shows watt as derived from volt and ampere.

Why Other Options Are Wrong:(a) Volt measures electric potential difference. (b) Watt measures power. (d) Ohm measures resistance. None are base units for current.

Common Pitfalls:Confusing commonly seen units with base units; many electrical units are derived from A, s, kg, m, and K.

Final Answer:ampere.