Question

Name the physical quantity of which the unit is ampere:
A. Current
B. Capacitance
C. Charge
D. Voltage

Answer 1

Hint:- This is a problem of current electricity. Ampere is defined as a unit of electric current equal to a flow of one coulomb charge per second. So we will find the solution of this problem using this definition of ampere.

Complete step by step answer:
We know that the ampere is defined as a unit of electric current equal to a flow of one coulomb charge per second. So, we can write this one as-
1 Ampere = 1 Coulomb per second

Now, we check each given option for this result-
In option (A), Current is defined as the rate of flow of charge.

Electrical Current is the flow of charged particles. The flow of charges will be constant in current electricity. For the current to flow we need a circuit. The electrons in a current flow flow from negative to positive. Electrons flow in the direction opposite to the direction of electric current.

Current = Charge/time interval

The SI unit of current is Coulomb/second as per above formula. It is equivalent to ampere.

So we can say that the unit of current is ampere.

The correct answer is option (A).
Electric current flows from higher electric potential to lower electric potential. Electric Current is divided into two - Direct Current (DC) and Alternating Current (AC). In Direct Current, the electric charge flows in one direction. In Alternating Current, the direction of the electric charge changes sporadically. DC current is obtained from a cell or battery. AC current is obtained from AC generators and mains.

Note: Sometimes we ignore the basic definitions of standard units like ampere, farad, ohm. That should be memorized to understand the real meaning of these measurements.