Ohms Law Calculators
Ohm's LawThis Ohms Law Calculator uses the Ohms Law equation to calculate Voltage, Current or Resistance.
Ohm’s Law is the definition of the relationship between Voltage Current and Resistance. It states that the relationship between voltage and resistance is directly proportional to the resistance of the conductor. The Ohms Law is defined by the following equation: 
Where:
I = Current V = Voltage R = Resistance |
The Ohm's Law Equation can also be rearranged to calculate Voltage and Resistance:
Ohms Law for Voltage Equation
Ohm's Law for Resistance Equation
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Example:
For example, take the simple circuit below:
Taking this very simple circuit, we can see there is a Battery supplying a Voltage of 9v, and a resistor applying 100 ohms of resistance in the circuit. Using the Ohms Law Calculator, we know that the equation states that the current pulled by the resistor would equal the voltage; in this case 9 volts, divided by the resistance; 100 Ohms:
Using the Ohm’s Law Calculator for Current: 9v divided by a resistance of 100 Ohms equals 0.09Amperes, or 90millamps.