Ohms law calculator

This calculator helps you to compute the Voltage, Current, Resistance, Power, and Wattage rating of a resistor in an electronic circuit. This calculator needs a minimum of two inputs to calculate the results. All the fields except Power can be used as input.

  • Voltage, Current, Resistance : Input/Output
  • Power: Output
You can also determine the necessary wattage rating of a resistor to use in a circuit using this calculator. As a rule of thumb use resistor which has wattage rating twice the actual power dissipation in it.

FORMULAS:

This calculator uses variations of Ohms law to calculate results To determine voltage V = IR To determine Current I = V / R To determine resistance R = V / I To calculate power P = VI   
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