What is the SI unit of electric charge, and how is it related to current?

The SI unit of electric charge is the coulomb (C). One coulomb is defined as the amount of charge transferred when a current of one ampere flows for one second. This relationship is expressed as:

$$Q=I\times t$$

where Q is charge (C), I is current (A), and t is time (seconds).

This equation shows that charge is directly proportional to current and time. For example, if a current of 2 A flows for 3 seconds, the total charge moved is:

$$Q=2\times 3=6C$$

This concept is important in electrical circuits and helps understand the movement of electrons.