Ohm's Law Calculator: Voltage, Current & Resistance
Calculate Voltage (V), Current (I), or Resistance (R).
Understanding Ohm's Law
Ohm's Law describes the relationship between voltage, current, and resistance in an electrical circuit. It states that the current flowing through a conductor is directly proportional to the voltage applied across it.
The Formulas
- <strong>Voltage (V) = I × R</strong> (Current × Resistance)
- <strong>Current (I) = V / R</strong> (Voltage ÷ Resistance)
- <strong>Resistance (R) = V / I</strong> (Voltage ÷ Current)
Electronics FAQs
What is 'V'?
V stands for Voltage, measured in Volts. It is the electrical pressure pushing electrons through the circuit.
Does this work for AC circuits?
Ohm's law applies strictly to DC circuits and purely resistive AC circuits. For AC circuits with capacitors or inductors, you must calculate Impedance (Z) instead of just Resistance.