// multi-utility computation suite · offline · instant · precise
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sci.ohms-law-power Calculator
Calculates electrical power dissipation using P = IV, P = I²R, and P = V²/R for resistive circuits. A 60 W bulb at 120 V draws 0.5 A and has 240 Ω effective resistance — at 240 V, the same resistor would dissipate 240 W.
Inputs
Voltage
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
Current
Rate of charge flow (A). I = V/R. Above ~100 mA through the body can be lethal. Fuses protect against overcurrent.
Resistance
Opposition to current flow (Ω). V = IR. Resistors in series add; in parallel their reciprocals add.
Results
power P=VI
Reference formula or conversion factor shown for context.
power P=I²R
Reference formula or conversion factor shown for context.
power P=V²/R
Reference formula or conversion factor shown for context.
V = I × R check
A pass/fail verification against the applicable code, standard, or threshold.
energy in 1hr (kWh)
Sample size or count used in the calculation.
Ohm: V=IR, P=VI=I²R=V²/R
Reference formula or conversion factor shown for context.