Ohm's Law is the most fundamental principle in electrical engineering, describing the relationship between Voltage (V), Current (I), and Resistance (R). It states that the current flowing through a conductor is directly proportional to the voltage applied and inversely proportional to the resistance. Whether you are troubleshooting a household appliance, designing an LED circuit for a hobby project, or studying for a physics exam, understanding these values is critical. Our Ohm's Law Calculator allows you to input any two known values to solve for the others, including Power (Watts).
输入任意两个值来计算其他值。
Circuit Analysis
12.00 V
12.00V, 2.00A, 6.00Ω, 24.00W
Voltage (V)12.00
Current (I)2.00
Resistance (R)6.00
Power (P)24.00
工作原理
The tool identifies which variables you have provided and applies the corresponding algebraic rearrangement of V=IR. It also solves for Power using the standard P=VI or P=I²R formulas.
计算公式
V = I × R | P = V × I
Calculation Examples
1. **LED Circuit**: A 12V source with a 470Ω resistor will result in a current of **~0.025 Amps (25mA)**.
2. **Appliance**: A 120V heater drawing 10A of current is consuming **1,200 Watts**.
Why use this tool in your daily life?
Safety through understanding. This service prevents electrical overloads and ensures your components are correctly sized for their power source, making it an essential utility for anyone working with modern electronics.