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sci.physics-ohm-law Calculator
Calculates voltage, current, and resistance using Ohm's law (V = IR) and power dissipation (P = IV = I²R = V²/R). Doubling voltage doubles current in a resistor — doubling resistance halves current at fixed voltage.
Inputs
V
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
R
Opposition to current flow (Ω). V = IR. Resistors in series add; in parallel their reciprocals add.
Results
current I
Electric charge flow rate (A). Governs wire sizing — too much current causes dangerous heating. Fuses protect circuits from overcurrent.
power P=VI
Reference formula or conversion factor shown for context.
power P=I\u00b2R
Reference formula or conversion factor shown for context.