What is electrical power?

Power P = V × I (watts). Also P = I²R = V²/R. It measures the rate of energy transfer — a 60W light bulb at 120V draws 0.5 amperes.

What is a practical example of Ohm's Law?

A 12V car battery connected to a 6-ohm resistance will draw 12/6 = 2 amperes of current and dissipate 12×2 = 24 watts of power.

Does Ohm's Law apply to all materials?

Ohm's Law applies to ohmic (linear) materials like copper wire at constant temperature. It doesn't apply to diodes, transistors, or other non-linear components.

Ohm's Law Calculator — Voltage, Current & Resistance

Ohm's Law states that Voltage (V) = Current (I) × Resistance (R). This calculator lets you solve for any one variable when two are known. It also computes electrical power (P = V × I). Essential for electronics, electrical engineering, circuit design, and physics students.

Solve For

Voltage V (volts)

Current I (amperes)

Resistance R (ohms)

Frequently Asked Questions

Ohm's Law: V = I × R. Voltage (volts) equals current (amperes) times resistance (ohms). Rearranged: I = V/R and R = V/I.

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