Basic unit of electrical quantity, equal to 6.28 billion - billion electrons.

Basic unit of electrical quantity, equal to 6.28 billion - billion electrons.

• A. Coulomb
• B. Ampere
• C. Volt
• D. Ohm

Answer: (A)

Charge is measured in Coulombs. One Coulomb equals the amount of charge carried by about 6.24×10^18 electrons, since each electron has a charge of roughly 1.602×10^-19 C. If you have 6.28×10^9 electrons, the charge is Q = N × e ≈ 6.28×10^9 × 1.602×10^-19 C ≈ 1.0×10^-9 C, i.e., about a nanoCoulomb. The other units describe current (Ampere), voltage (Volt), and resistance (Ohm), not the basic quantity of charge itself. So Coulomb is the correct unit.

Charge is measured in Coulombs. One Coulomb equals the amount of charge carried by about 6.24×10^18 electrons, since each electron has a charge of roughly 1.602×10^-19 C. If you have 6.28×10^9 electrons, the charge is Q = N × e ≈ 6.28×10^9 × 1.602×10^-19 C ≈ 1.0×10^-9 C, i.e., about a nanoCoulomb. The other units describe current (Ampere), voltage (Volt), and resistance (Ohm), not the basic quantity of charge itself. So Coulomb is the correct unit.