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Ohm's Law Triangle

Understanding Ohm's Law

Ohm's Law is a fundamental principle in electrical engineering that describes the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit.

The Basic Formula

Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage and inversely proportional to the resistance:

  • V = I × R (Voltage = Current × Resistance)
  • I = V ÷ R (Current = Voltage ÷ Resistance)
  • R = V ÷ I (Resistance = Voltage ÷ Current)

Power Calculations

Power (P) in an electrical circuit can be calculated using these formulas:

  • P = V × I (Power = Voltage × Current)
  • P = I² × R (Power = Current² × Resistance)
  • P = V² ÷ R (Power = Voltage² ÷ Resistance)

Common Applications

Ohm's Law is used in many practical applications:

  • Designing and analyzing electrical circuits
  • Calculating power requirements for electronic devices
  • Troubleshooting electrical problems
  • Selecting appropriate components for circuits
  • Battery life calculations

Pro Tip:

When using this calculator, you only need to enter any two values to find the others. The calculator will automatically determine the remaining values using Ohm's Law relationships.