Cum se calculează Ohm's Law

Ce este Ohm's Law?

Ohm's Law relates voltage, current, and resistance in electrical circuits. This calculator solves for any one of the four quantities — voltage (V), current (I), resistance (R), or power (P) — given any two known values.

Formulă

V = IR · P = IV = I²R = V²/R

Ghid pas cu pas

1Enter any two known values (V, I, R, or P)
2The calculator solves the remaining two using Ohm's Law and the power formula
3Results apply to DC circuits and to AC circuits at unity power factor

Exemple rezolvate

Intrare

V = 12V · R = 47Ω

Rezultat

I = 12/47 ≈ 0.255 A · P = 12 × 0.255 ≈ 3.06 W

A 1/4W resistor would overheat here — use at least a 1/2W rated part

Greșeli frecvente de evitat

✕Applying Ohm's Law to non-linear components (diodes, transistors)
✕Forgetting unit prefixes: mA, kΩ, mW

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