Coulomb is defined as ...

Coulomb is defined as ...

• A. A unit of voltage
• B. A unit of current
• C. The basic unit of electric charge
• D. A unit of resistance

Answer: (C)

Coulomb is the unit used to quantify electric charge. It’s defined as the amount of charge that passes a point in a conductor when a steady current of one ampere flows for one second. In other words, Q = I × t, so one coulomb equals 1 A × 1 s. This makes the Coulomb a measure of total charge, not of voltage, current, or resistance. For context, 1 Coulomb is about 6.242×10^18 elementary charges (like electrons). Practical link: a typical battery’s stored charge in ampere-hours can be converted to Coulombs, for example 2 Ah equals 7200 Coulombs. Voltage is measured in volts, current in amperes, and resistance in ohms, so the Coulomb uniquely represents the amount of electric charge.

Coulomb is the unit used to quantify electric charge. It’s defined as the amount of charge that passes a point in a conductor when a steady current of one ampere flows for one second. In other words, Q = I × t, so one coulomb equals 1 A × 1 s. This makes the Coulomb a measure of total charge, not of voltage, current, or resistance. For context, 1 Coulomb is about 6.242×10^18 elementary charges (like electrons). Practical link: a typical battery’s stored charge in ampere-hours can be converted to Coulombs, for example 2 Ah equals 7200 Coulombs. Voltage is measured in volts, current in amperes, and resistance in ohms, so the Coulomb uniquely represents the amount of electric charge.