Question

Unit of electrical current is :

• A. ampere
• B. coulomb
• C. joule
• D. volt

Hint:

Associate these basic electrical quantities with their SI units:
Current \(\rightarrow\) Ampere (A)
Charge \(\rightarrow\) Coulomb (C)
Voltage \(\rightarrow\) Volt (V)
Energy \(\rightarrow\) Joule (J)

Answer 1

The Correct Option is A

Concept: Each fundamental physical quantity has a standard unit in the International System of Units (SI). Step 1: Define Electrical Current Electrical current (symbol: \(I\)) is the rate of flow of electric charge. If a charge \(Q\) flows past a point in a time \(t\), the current is \(I = Q/t\). Step 2: Identify the SI unit of Electrical Current The SI unit for electrical current is the ampere (symbol: A). One ampere is defined as one coulomb of charge flowing per second (1 A = 1 C/s). Step 3: Units of other options
Coulomb (C): The SI unit of electric charge (\(Q\)).
Joule (J): The SI unit of energy or work (\(W\) or \(E\)).
Volt (V): The SI unit of electric potential difference or voltage (\(V\)). (1 V = 1 J/C). Therefore, the unit of electrical current is the ampere.