Understanding the Ampere Unit

The question asks for the correct equivalent unit of the Ampere, which is the standard unit of electric current in the International System of Units (SI).

Defining Electric Current

Electric current is fundamentally defined as the rate at which electric charge flows past a point in a circuit. In simpler terms, it measures how much charge flows through a wire or conductor in a given amount of time.

Analyzing the Units

Let's break down the definition and relate it to the options provided:

• Electric Current = Amount of Charge / Time Taken
• The SI unit for electric charge is the Coulomb (denoted as $C$).
• The SI unit for time is the second (denoted as $s$).

Therefore, the unit of electric current can be expressed as Coulombs per second ($C/s$).

Evaluating the Options

Let's examine each option based on this understanding:

• Option 1: Charge per meter - This represents linear charge density, not current. The unit is Coulomb per meter ($C/m$).
• Option 2: Charge meter per second - This combination of units does not represent a standard physical quantity related to current.
• Option 3: Coulomb per volt - This is the unit of electrical conductance, which is the reciprocal of resistance. It is equivalent to the Farad ($F$), the unit of capacitance.
• Option 4: Coulomb per second - This directly matches the definition of electric current. 1 Ampere ($A$) is defined as 1 Coulomb of charge flowing per second. So, $1 \, A = 1 \, C/s$.

Conclusion on Ampere Unit

Based on the definition of electric current, the Ampere ($A$) is equivalent to Coulombs per second ($C/s$). This makes Option 4 the correct answer.