Ohm's Law describes the relationship between Voltage (V), Current (I), and Resistance (R). Enter any two known values, and the calculator will determine the remaining two, plus Power (P).
- Voltage (V): Electrical potential difference, measured in Volts.
- Current (I): Flow of electric charge, measured in Amperes.
- Resistance (R): Opposition to current flow, measured in Ohms.
- Power (P): Rate of energy transfer, measured in Watts.
Ohm's Law vs. Power Formula
While Ohm's Law (V = I × R) relates voltage, current, and resistance, the Power Formula (P = V × I) relates power, voltage, and current. Together, they form the 12 formulas shown in the wheel above, allowing you to calculate any value if you know two others.
