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Electrical Current Calculations

 This portion of this site is intended to help you calculate current levels in a circuit. You can calculate any unknown value if you know the other two in the equation.

Explanation of Terms

E - stands for voltage, the unit is the Volt.
I - stands for current, the unit is the Amp.
P - stands for power, the unit is the Watt.
R - stands for resistance/impedance, the unit is the Ohm.

The Formulas

I = E  / R
I = P  / E
I =

Current

  Click the unknown measurement type (Voltage/Power/Resistance), then enter the two values that you do know, and press the "Calculate Power" button to get your answer. If you have more than one value to calculate, just change the value(s) you want to adjust and click the button again (if you change to a new measurement type - make sure you click the "Reset" button first).

Which number is unknown ?

Voltage  Power  Resistance 

Enter Voltage Volts
Enter Power Watts
Enter Resistance   Ohms

Current =  Amps

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