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Ohm’s Law Calculator — Voltage, Current & Resistance
Calculate voltage (V), current (I), resistance (R), and electrical power (P) in watts.
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Ohm's Law Circuit Variables
Ohm’s Law and Electrical Power Equations
Transparent mathematical methodology explained in plain English.
V = I × R | P = V × I = I²R = V² / R Governs linear electrical circuits relating potential difference (V), charge flow (I), resistance (R), and energy dissipation rate (P).
Variables Explained:
- V: Voltage (Volts).
- I: Current (Amperes).
- R: Resistance (Ohms, Ω).
- P: Power (Watts).
Real Project Example
12V Circuit with 4Ω Resistance
Finding current draw and wattage.
Sample Project Inputs:
Voltage: 12V
Resistance: 4Ω
Step-by-Step Calculation:
- Current I = V / R = 12 / 4 = 3 Amperes.
- Power P = V × I = 12 × 3 = 36 Watts.
Calculated Answer: Current = 3.0 Amps; Power = 36.0 Watts.
Knowledge Base
Frequently Asked Questions: Ohm’s Law Calculator
Click any question below to expand quick answers, formulas, and expert tips.
Can Ohm’s law be used for AC circuits?
Ohm’s law applies to AC circuits with purely resistive loads. For AC circuits with capacitors or inductors, resistance is replaced by impedance (Z).