Ohm's Law Calculator FAQ
What is Ohm's Law?
Ohm's Law states that voltage equals current multiplied by resistance: V = I x R, where V is voltage, I is current, and R is resistance.
How do you calculate current using Ohm's Law?
Rearrange the formula to I = V / R. If you know the voltage and resistance, the calculator divides voltage by resistance to get current.
How do you calculate resistance from voltage and current?
Use R = V / I. This is useful for resistor sizing, quick circuit checks, and simple LED calculations.
How do you calculate electrical power (P)?
You can use P = V x I, P = I^2 x R, or P = V^2 / R. The calculator picks the matching formula from the values you provide.
What does 2-of-4 mode mean in the calculator?
Four quantities are linked: voltage, current, resistance, and power. Any two known values determine the other two, so the calculator lets you solve the full set from a 2-of-4 input combination.
What units does the calculator support?
It supports common voltage, current, resistance, and power units such as V, mV, A, mA, ohm, kOhm, W, mW, and kW.
How do you use Ohm's Law to design an LED circuit?
A common LED resistor formula is R = (Vsupply - Vled) / Iled. This calculator helps with the resistor value and the resistor power check when you know the supply voltage, LED drop, and target current.
When is an Ohm's Law calculator useful?
It is useful for electronics homework, DC circuit checks, resistor sizing, LED wiring, power calculations, and quick troubleshooting when you know any two of the core electrical values.
