Which is the SI unit of electric charge?

Which is the SI unit of electric charge?

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

Answer: (C)

Electric charge is measured in coulombs in the SI system. The fundamental idea is that charge flow is tied to current over time: current equals charge per time, I = dQ/dt, so the total charge transferred is Q = I t. This defines the coulomb: 1 coulomb is the amount of charge moved by a current of 1 ampere in 1 second. For example, 2 A flowing for 3 seconds transfers 6 coulombs of charge. The other units are for different quantities: farad for capacitance, volt for electric potential difference, and joule for energy. Since we’re talking about how much charge, the coulomb is the appropriate unit.

Electric charge is measured in coulombs in the SI system. The fundamental idea is that charge flow is tied to current over time: current equals charge per time, I = dQ/dt, so the total charge transferred is Q = I t. This defines the coulomb: 1 coulomb is the amount of charge moved by a current of 1 ampere in 1 second. For example, 2 A flowing for 3 seconds transfers 6 coulombs of charge. The other units are for different quantities: farad for capacitance, volt for electric potential difference, and joule for energy. Since we’re talking about how much charge, the coulomb is the appropriate unit.