Charge Converter
Coulomb (C)
Definition: The coulomb (symbol: C) is the SI unit of electric charge. It is the charge transported by a constant current of one ampere in one second.
History/origin: Named after the French physicist Charles-Augustin de Coulomb, who developed Coulomb's law to describe the force between electrical charges in the 18th century.
Current use: The coulomb is the fundamental unit used in physics and electrical engineering to calculate electrical force and capacitance.
Ampere-hour (Ah)
Definition: An ampere-hour is a unit of electric charge, representing the charge transferred by a steady current of one ampere flowing for one hour.
History/origin: As battery technology evolved for industrial use, engineers needed a unit that combined current and time to describe how long a power source would last.
Current use: Ah is the standard rating for deep-cycle batteries, lead-acid car batteries, and large-scale energy storage systems.
Coulomb (C) to Ampere-hour (Ah) Conversion Table
| Coulomb (C) [c] | Ampere-hour (Ah) [ah] |
|---|---|
| 0.01 c | 0.00000278 ah |
| 0.1 c | 0.00002778 ah |
| 1 c | 0.00027778 ah |
| 2 c | 0.00055556 ah |
| 3 c | 0.00083333 ah |
| 5 c | 0.00138889 ah |
| 10 c | 0.00277778 ah |
| 20 c | 0.00555556 ah |
| 50 c | 0.01388889 ah |
| 100 c | 0.02777778 ah |
| 1000 c | 0.27777778 ah |
How to Convert Coulomb (C) to Ampere-hour (Ah)
1 c = 0.00027778 ah
1 ah = 3600 c
Example: convert 15 c to ah:
15 c = 15 × 0.00027778 ah = 0.00416667 ah
Did You Know?
- Did you know? One Coulomb (C) is equivalent to the charge of approximately 6.242 quintillion (6.242 x 10¹⁸) electrons! It is named after Charles-Augustin de Coulomb.
- The Ampere-hour (Ah) is often used to measure the total energy capacity of larger batteries, like those in cars or solar power systems. 1 Ah equals exactly 3,600 Coulombs.