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Ohms Law Calculator

Calculators and Explanation

Home>Tools>Ohm's Law Calculator

Ohms Law Calculators

Ohm's Law

This 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:

Ohm's Law Equation: Current equals voltage divided by resistance
Where:
I = Current
V = Voltage
R = Resistance

Ohm's Law Current Calculator

  Resistance
Voltage



Current



CalculateClear

​The Ohm's Law Equation can also be rearranged to calculate Voltage and Resistance:

Ohms Law for Voltage Equation

Ohm's Law for Voltage Equation: Voltage equals current multiplied by resistance

Ohm's Law Voltage Calculator

Current
  Resistance



Voltage



CalculateClear

Ohm's Law for Resistance Equation

Ohm's Law equation for resistance: Resistance equals voltage divided by current

Ohm's Law Resistance Calculator

Current
Voltage



  Resistance



CalculateClear

Example:

For example, take the simple circuit below:
simple circuit with a 9v bettery connected to a 100 ohm resistor
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:
Example ohms law calculation: 9 volts divided by 100 ohms equals 90 milliamps
​Using the Ohm’s Law Calculator for Current: 9v divided by a resistance of 100 Ohms equals 0.09Amperes, or 90millamps.

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  • NEWS
  • Calculators/Tools
    • Inch To Metric Conversion Table
    • Thermal Expansion Calculator
    • Stress, Strain and Young's Modulus
    • Beam Deflection Calculators >
      • Single Load Cantilever Beam Deflection Calculator
      • Single load supported beam deflection calculator
      • Even load cantilever beam deflection calculator
      • Even load supported beam deflection calculator
    • Cutting Speed, Spindle, Feed Rate MRR Calculators
    • Pressure Calculator
    • MTBF, MTTR and Reliability
    • Ohm's Law Calculator
    • Capacitance Calculator
    • Laws of Thermodynamics
    • Heat Transfer >
      • Radiation, Absorbance, Emissivity and Reflectivity
    • Theory of Constraints
    • Entropy and Specific Entropy Calculators
    • Alloying Elements of Steel
    • Kinetic Energy Calculator
    • Potential Energy Calculator
    • Refractive Index Calculator
  • About
  • Contact Us