Electric Charge Converter
Convert between coulombs, ampere-hours, and more
Conversion Formula:
Multiply by 0.00027778
Common Conversions
Understanding Electric Charge
Electric charge is a fundamental property of matter that determines how it interacts with electromagnetic fields. It is a conserved quantity, meaning the total charge in an isolated system remains constant.
Key Concepts:
- The SI unit of electric charge is the coulomb (C)
- One coulomb equals the charge of approximately 6.242 x 1018 electrons
- The elementary charge (e) is the charge of a single electron or proton
- Ampere-hour (Ah) is commonly used for battery capacity
Important Relationships:
- Current (I): Rate of charge flow, measured in amperes (A)
- Charge (Q) = Current (I) x Time (t)
- 1 Ah = 3600 C (1 ampere flowing for 1 hour)
- Capacitance (C) = Charge (Q) / Voltage (V)
Applications:
Battery Capacity
Battery specifications often use ampere-hours (Ah) or milliampere-hours (mAh) to indicate how much charge they can store.
Electronic Circuits
Capacitors store electric charge and are rated in farads (F), which is equivalent to one coulomb per volt.
Common Battery Capacities
| Device | Capacity (mAh) | Equivalent (C) |
|---|---|---|
| Watch battery | 40-100 | 144-360 |
| Wireless earbuds | 50-150 | 180-540 |
| Smart watch | 200-500 | 720-1,800 |
| Smartphone | 3,000-5,000 | 10,800-18,000 |
| Laptop | 5,000-10,000 | 18,000-36,000 |
| Electric car | 40,000-100,000 | 144,000-360,000 |
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Visual Comparison
Electric Charge Visualization
Real-world equivalent:
Typical charge used in a few minutes of smartphone usage
Number of electrons:
6.24e+18 electrons
Common charges:
Mobile tip: Swipe left or right on the unit dropdown to quickly change units, or use the arrow buttons
About the Electric Charge Converter
Convert between coulombs, ampere-hours, and more All conversions run instantly in your browser and nothing you enter is sent to a server.
Common Conversion Formulas
| From | To | Formula |
|---|---|---|
| Coulombs (C) | Ampere-hours (Ah) | Ah = C / 3600 |
| Milliampere-hours (mAh) | Ampere-hours (Ah) | Ah = mAh / 1,000 |
| Charge (Q) | Current (I), Time (t) | Q = I × t |