Electric current is the flow of electric charge through a conductor, fundamental to all electrical and electronic systems. From the tiny microamperes in a sensor to the massive kiloamperes in industrial processes, understanding current measurement is essential for anyone working with electricity. Our converter handles SI units (amperes and their prefixes) as well as historical and specialized units used in physics.
André-Marie Ampère established the mathematical foundations of electromagnetism in the 1820s, leading to the naming of the ampere. The original ampere was defined using the force between current-carrying wires. In 2019, the SI redefined the ampere based on the elementary charge, making it exactly 1/(1.602176634 × 10⁻¹⁹) electrons per second.
Divide milliamperes by 1,000 to get amperes.
Example: 500 mA ÷ 1,000 = 0.5 A
Current (I) equals voltage (V) divided by resistance (R).
Example: 12 V / 4 Ω = 3 A
Current equals power divided by voltage.
Example: 60 W / 120 V = 0.5 A
Divide microamperes by 1,000 to get milliamperes.
Example: 2,500 μA ÷ 1,000 = 2.5 mA
A typical smartphone charger delivers about 2 amperes at 5 volts.
A typical LED operates at around 20 milliamperes.
A standard US household circuit is rated for 15-20 amperes.
A Level 2 EV charger typically provides about 30-40 amperes.
A cardiac pacemaker uses current pulses of only a few microamperes.
A typical lightning bolt carries about 30,000 amperes of current.
| 1 A = 0.1 abA | 1 ampere equals 0.1 abampere | 1 * 0.1 = X abA |
| 1 A = 0.1 Bi | 1 ampere equals 0.1 biot | 1 * 0.1 = X Bi |
| 1 A = 100 cA | 1 ampere equals 100 centiampere | 1 * 100 = X cA |
| 1 A = 1 C/s | 1 ampere equals 1 coulomb-second | 1 * 1 = X C/s |
| 1 A = 0.1 EMU | 1 ampere equals 0.1 EMU of current | 1 * 0.1 = X EMU |
| 1 A = 2997924536.8431435 ESU | 1 ampere equals 2997924536.8431435 ESU of current | 1 * 2997924536.8431435 = X ESU |
| 1 A = 2997924536.8431435 Fr/s | 1 ampere equals 2997924536.8431435 franklin-second | 1 * 2997924536.8431435 = X Fr/s |
| 1 A = 2997924536.8431435 GEC | 1 ampere equals 2997924536.8431435 gaussian electric current | 1 * 2997924536.8431435 = X GEC |
| 1 A = 1e-9 GA | 1 ampere equals 1e-9 gigaampere | 1 * 1e-9 = X GA |
| 1 A = 1.2566370542658103 Gi | 1 ampere equals 1.2566370542658103 gilbert | 1 * 1.2566370542658103 = X Gi |
| 1 A = 0.001 kA | 1 ampere equals 0.001 kiloampere | 1 * 0.001 = X kA |
| 1 A = 0.000001 MA | 1 ampere equals 0.000001 megaampere | 1 * 0.000001 = X MA |
| 1 A = 1000000 μA | 1 ampere equals 1000000 microampere | 1 * 1000000 = X μA |
| 1 A = 1000 mA | 1 ampere equals 1000 milliampere | 1 * 1000 = X mA |
| 1 A = 1000 mA | 1 ampere equals 1000 milliamp | 1 * 1000 = X mA |
| 1 A = 999999999.9999999 nA | 1 ampere equals 999999999.9999999 nanoampere | 1 * 999999999.9999999 = X nA |
| 1 A = 1000000000000 pA | 1 ampere equals 1000000000000 picoampere | 1 * 1000000000000 = X pA |
| 1 A = 1 S·V | 1 ampere equals 1 siemens volt | 1 * 1 = X S·V |
| 1 A = 2997924536.8431435 stA | 1 ampere equals 2997924536.8431435 statampere | 1 * 2997924536.8431435 = X stA |
| 1 A = 1e-12 TA | 1 ampere equals 1e-12 teraampere | 1 * 1e-12 = X TA |
| 1 A = 1 V/Ω | 1 ampere equals 1 volt-ohm | 1 * 1 = X V/Ω |
| 1 A = 1 W/V | 1 ampere equals 1 watt-volt | 1 * 1 = X W/V |
| 1 A = 1 Wb/H | 1 ampere equals 1 weber-henry | 1 * 1 = X Wb/H |