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math.physics-ohms-law Calculator
Calculates voltage, current, resistance, or power from any two known values using Ohm's Law (V = IR) and the power relations. The four-way relationship between V, I, R, and P is the foundational circuit analysis tool for any electrical calculation.
Inputs
V
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
I
Rate of charge flow (A). I = V/R. Above ~100 mA through the body can be lethal. Fuses protect against overcurrent.
R
Opposition to current flow (Ω). V = IR. Resistors in series add; in parallel their reciprocals add.
Results
voltage (V)
Electric potential difference between the two terminals (V). In AC systems, quoted as RMS — 230 V mains has a peak of ~325 V.
current (I)
Electric charge flow rate (A). Governs wire sizing — too much current causes dangerous heating. Fuses protect circuits from overcurrent.
resistance (R)
Opposition to current flow (Ω). Ohm's Law: V = IR. Lower resistance means more current for the same voltage.
power (P=VI)
Reference formula or conversion factor shown for context.
status
Current state of the system, process, or metric — typically pass/fail, healthy/warning/critical, or a descriptive classification.