How to Calculate Milliamps

Calculate Shunt Resistors
••• Images

Ohm's Law is the basic formula for electronics. With it, we may calculate Resistance (Ohms), Voltage (Volts) or Current (Amps) by knowing any two of the three values.

How to Calculate Milliamps

    A milliamp is one one-thousandth of an amp. By calculating the value in amps and dividing by one thousand, you will have a value of current in milliamps.

    Ohm's Law is Voltage = Resistance X Current. The derivations are: Resistance = Voltage / Current Current = Voltage / Resistance

    Calculate Current using your known Voltage and Resistance as shown in Step 2. Current (I) = Voltage (V) divided by Resistance (R) I = V/R Ex: if your voltage is 12V and resistance is 200 Ohms I = V/R = 12 / 200 = 0.06 Amps

    Knowing your Current in Amps, multiply by 1000 to see the value in milliamps Ex: 0.06 Amps x 1000 = 60 milliamps

    Given a known Voltage and Current, you may also derive Power (Watts). Power = Voltage times Current ( P = V x I ) Ex: 12V x 0.06A = 0.72W or 720 milliwatts

    Things You'll Need

    • Known voltage value
    • Known resistance value

Related Articles

How to Calculate LED Power
How to Calculate Millivolts to Amps
How to Convert Watts to Volts
How to Use Significant Figures in Multiplication and...
How to Calculate DC Voltage
How to Find Resistance With Power & Voltage
How to Find Correlation Coefficient & Coefficient of...
How to Convert Kilopascals to Joules
How to Convert 12 Volt Alternator to 120 Volts
How to Convert Ohms to Kilowatts
How to Convert mm Hg to in Hg
How to Wire a Battery in Series
How to Regulate DC Power With Resistors
How to Change a Ratio Into a Decimal
How to Use a 9-Volt Battery to Power LEDs
How to Calculate Millivolts from Microsiemens
How to Find the Radius
How to Calculate Slope Using the TI-83 Plus
How to Do a Bell Curve on a TI

Dont Go!

We Have More Great Sciencing Articles!