What is the SI unit for electric charge?

• A. Joule
• B. Ohm
• C. Coulomb
• D. Farad

Answer: (C)

The SI unit for electric charge is the coulomb. This unit is defined as the amount of electric charge transferred by a constant current of one ampere in one second. It is a fundamental concept in electrical theory, as electric charge is a key component of electricity that allows for interactions between charged particles. The coulomb quantifies this charge, allowing engineers and scientists to measure and manipulate electrical phenomena accurately. Other units provided in the choices relate to different aspects of electrical theory; for instance, the joule measures energy, the ohm measures electrical resistance, and the farad measures capacitance. Understanding the specific role of the coulomb is crucial for anyone studying electrical systems, as it is the cornerstone for calculations regarding current, voltage, and stored energy in capacitors.