Ohm’s law calculator

How is Ohm’s Law Calculator: Voltage, Current, Resistance, Power calculated?

Use V = IR; P = VI = I²R = V²/R. Solve voltage, current, resistance and power from six input pairs. Check resistor-power examples and distinguish DC resistance from AC impedance.

Sources: openstax.org [1]

How do I calculate this example: V = 12 V, R = 1000 Ω?

I = 0.012 A; P = 0.144 W. This is a calculated example under the model stated above; it is not a measured component specification.

Which units does Ohm’s Law Calculator: Voltage, Current, Resistance, Power use?

V, A, Ω, W. Convert prefixes before substituting values; keep the input and output units attached to every number.

Sources: openstax.org [1]

Does Ohm’s law apply to an LED directly?

An LED is nonlinear. Use its forward-voltage/current data; apply Ohm’s law to the series resistor, not a fixed LED resistance.

Sources: ti.com [1]

Is calculated power the resistor rating I should buy?

No. Choose a rating with margin for ambient temperature, pulses, tolerance and the manufacturer’s derating curve.

Sources: openstax.org [1]

Can I use this DC result for an AC load?

For a purely resistive AC load, use RMS voltage and current. Reactive loads require impedance and power factor; P is not generally Vrms × Irms.

Sources: fluke.com [1]