Kuinka laskea Ohm's Law

Mikä on 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.

Kaava

V = IR · P = IV = I²R = V²/R

Vaiheittainen opas

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

Ratkaistut esimerkit

Syöte

V = 12V · R = 47Ω

Tulos

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

Yleisiä virheitä vältettäväksi

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

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