Enter any two known values — Voltage (V), Current (I), Resistance (R), or Power (P) — and the DC Power Calculator solves for the remaining unknowns using Ohm's Law and Joule's Law, giving you all four values at once.
Power
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Voltage
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Current
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Resistance
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DC power is calculated using P = V × I (power equals voltage times current). You can also use P = I²R or P = V²/R depending on which values you know.
DC power flows in one direction with constant voltage and current, while AC power alternates direction. DC power calculations are simpler as they don't involve phase angles or frequency considerations.
Power is measured in watts (W), voltage in volts (V), current in amperes (A), and resistance in ohms (Ω). The calculator accepts standard electrical units for accurate results.
Yes, you only need to enter any two values (voltage, current, resistance, or power) and the calculator will determine the remaining parameters using Ohm's law and power equations.
Ohm's law states V = IR (voltage equals current times resistance). Combined with power formulas, it allows calculation of all circuit parameters from any two known values.
The calculations are mathematically precise using standard electrical formulas. Results are accurate for ideal DC circuits, though real-world factors like component tolerances may introduce small variations.
The calculator prevents negative values as they're not physically meaningful for basic DC circuits. Zero values are handled appropriately based on the electrical relationships between parameters.
Yes, the calculator works for any range of DC values from microvolts/microamps to kilovolts/kiloamps. Just ensure you use consistent units and follow proper safety practices in real applications.