Current (Ampere) Converter
Convert between amperes, milliamperes, microamperes, kiloamperes, abamperes, statamperes, and more instantly.
Result
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All conversions
What is Current (Ampere) Converter?
A current converter lets you switch between units of electric current — the flow of electric charge. The SI unit is the ampere (A). Milliamperes and microamperes are used in electronics and sensor circuits; kiloamperes and megaamperes in industrial and lightning scenarios. The abampere and statampere are CGS units used in classical electromagnetism.
How to use
- 1 Enter the current value in the Value field.
- 2 Select the unit you are converting from in the From dropdown.
- 3 Select the unit you want to convert to in the To dropdown.
- 4 The result and a full table of all equivalent currents appear instantly.
- 5 Click the swap button to reverse the conversion.
Formula
Example calculation
A typical USB device draws about 500 mA = 0.5 A. A lightning bolt can carry up to 30,000 A = 30 kA. To convert 500 mA to µA: 500 × 1000 = 500,000 µA.
Frequently asked questions
How many milliamps is dangerous?
Current as low as 10 mA can cause painful muscle contractions. 100–200 mA passing through the chest can cause ventricular fibrillation and be fatal. The exact danger depends on current path, duration, and frequency.
What is the difference between AC and DC current?
Direct current (DC) flows in one direction — batteries and solar panels produce DC. Alternating current (AC) reverses direction periodically — mains power is AC at 50 or 60 Hz. The ampere unit applies to both; for AC it refers to the RMS (root mean square) value.
What is an abampere?
The abampere (abA) is the CGS-electromagnetic unit of current, equal to exactly 10 amperes. It appears in older physics and engineering texts but has been replaced by the SI ampere in modern use.
What is a statampere?
The statampere is the CGS-Gaussian unit of current, equal to approximately 3.336 × 10⁻¹⁰ A. It is extremely small and only encountered in classical electromagnetic theory.
How does current relate to voltage and resistance?
Ohm's Law: I = V / R. Current in amperes equals voltage in volts divided by resistance in ohms. Doubling the voltage doubles the current; doubling the resistance halves it.