Electrical Unit Converter
Calculate any electrical value from two known values using Ohm's Law. Enter voltage and resistance, voltage and current, resistance and current, or power and voltage to find all other values.
Ohm's Law is the foundation of electrical engineering, relating voltage (V), current (I), resistance (R), and power (P).
Ohm's Law Formulas
- V = I × R (Voltage = Current × Resistance)
- I = V / R (Current = Voltage / Resistance)
- R = V / I (Resistance = Voltage / Current)
Power Formulas
- P = V × I (Power = Voltage × Current)
- P = I² × R (Power = Current² × Resistance)
- P = V² / R (Power = Voltage² / Resistance)
Units
- Voltage: Volts (V)
- Current: Amperes (A)
- Resistance: Ohms (Ω)
- Power: Watts (W)
Common Examples
- US household outlet: 120V, 15A circuit = 1,800W max
- European outlet: 230V, 16A circuit = 3,680W max
- LED bulb: 120V, 0.083A = 10W, resistance ≈ 1,440Ω