How to Convert mW to mA

Current can be calculated as well as measured directly.
••• Polka Dot Images/Polka Dot/Getty Images

When an electrical circuit is in use and an appliance of any kind is attached to it, electricians are concerned with four different values; voltage, current, resistance and power. All four values are linked by Ohm's Law, a set of equations that shows the relationships between the main electrical units. Power and current, measured in watts and amps, respectively, are linked via voltage, so thousandths of these values, milliwatts (mW) and milliamps (mA), are also linked via voltage.

    Divide the value in milliwatts by 1,000, the number of milliwatts in one watt. The result is the value expressed in watts. For example: 2,500 mW / 1,000 = 2.5 W.

    Divide the watt value by the voltage in the circuit. The result is the current flowing in the circuit, expressed in amps. As an example, a circuit is supplied with 4 volts, and the wattage is 2.5 watts. The current is 0.625 amps because 2.5 / 4 = 0.625.

    Multiply the current determined in Step 2 by 1,000, the number of milliamps in 1 amp. The result is the current expressed in milliamps. Continuing with the example: 0.625 A / 1,000 = 625 mA.


    • Ohm's Law can be remembered as amps = watts / volts.

Related Articles

Watt Hour Electric Meter Nameplate Specifications
How to Calculate 30 KW to Amps
How to Calculate Millivolts to Amps
How to Convert 12 Volt Alternator to 120 Volts
How to Find Wattage With Voltage & Frequency
How to Calculate Millivolts from Microsiemens
How to Measure Electric Motor Torque
How to Change Electrical Amps to Watts
How to Calculate KVA to MVA
An Electrical Engineer's Vocabulary Words
How to Convert Megawatts to Amps
How to Calculate a KVA Rating
How to Calculate Three Phase Amps From Megawatts
How Do I Convert Amps to Kw 3 Phase?
Types of Electrical Loads
What Is Ohm's Law & What Does It Tell Us?
How to Use a 9-Volt Battery to Power LEDs
How to Measure Wattage With a Multimeter
How to Convert 240 Single Phase to 480 3 Phase
How to Convert 12 Volt to 6 Volt

Dont Go!

We Have More Great Sciencing Articles!