What is the SI unit for measuring electric charge?

The SI unit for measuring electric charge is the coulomb. One coulomb corresponds to a certain quantity of charged particles, specifically the amount of charge transferred by a constant current of one ampere in one second. This relationship highlights the importance of coulombs in quantifying electrical charge in various contexts, such as in circuit calculations and electrostatics.

In contrast, volts, ohms, and watts represent different electrical concepts: volts measure electric potential or voltage, ohms indicate resistance, and watts quantify power. Although these units are all integral to understanding electricity, they pertain to different characteristics within electrical theory and don't directly measure the quantity of charge like coulombs do.