What is the basic unit of electrical quantity?

What is the basic unit of electrical quantity?

• A. Electromotive Force.
• B. Ampere.
• C. Volt.
• D. Coulomb

Answer: (D)

Electric charge is the amount of electricity, and its unit is the coulomb. The coulomb ties together current and time with the relation Q = I t, so one coulomb is the amount of charge that passes a point when a steady current of one ampere flows for one second. For example, 2 A flowing for 3 seconds transfers 6 coulombs of charge. The other quantities describe either the rate of flow (ampere, the unit of current) or the energy per unit charge (volt, the unit of potential difference or electromotive force), not the total amount of charge itself. That makes the coulomb the basic unit of electrical quantity in this context.

Electric charge is the amount of electricity, and its unit is the coulomb. The coulomb ties together current and time with the relation Q = I t, so one coulomb is the amount of charge that passes a point when a steady current of one ampere flows for one second. For example, 2 A flowing for 3 seconds transfers 6 coulombs of charge. The other quantities describe either the rate of flow (ampere, the unit of current) or the energy per unit charge (volt, the unit of potential difference or electromotive force), not the total amount of charge itself. That makes the coulomb the basic unit of electrical quantity in this context.