Resistor Calculator (Ohm’s & Power Law)

Resistor Calculator

Ohm’s Law & Power Law Solver (V, I, R, P)

Voltage (V)

Current (A)

Resistance (Ω)

Power (W)

— V

Voltage

— A

Current

— Ω

Resistance

— W

Power

How it works: Enter any two known values (e.g., Voltage and Current), and the calculator will determine the remaining two (Resistance and Power) based on Ohm’s Law and the Power Law.

Understanding Electrical Relationships: Ohm’s Law and the Power Law

The **Resistor Calculator** is a versatile tool based on the fundamental principles of electricity: **Ohm’s Law** and the **Power Law**. These laws describe the relationship between Voltage (V), Current (I), Resistance (R), and Power (P) in an electrical circuit.

Ohm’s Law: $V = I \times R$ (Voltage = Current $\times$ Resistance)

Power Law: $P = V \times I$ (Power = Voltage $\times$ Current)

Key Concepts:

Voltage (V): Also known as electric potential difference, it’s the force that pushes electrons through a circuit. Measured in Volts.
Current (A): The flow rate of electric charge. Measured in Amperes (Amps).
Resistance (Ω): The opposition to the flow of electric current. Measured in Ohms. Resistors are components designed to provide specific resistance.
Power (W): The rate at which electrical energy is converted into another form, such as heat, light, or motion. Measured in Watts.

How to Use This Calculator

This calculator allows you to find any two unknown values if you provide the other two:

Voltage (V): Enter the voltage if known.
Current (A): Enter the current if known.
Resistance (Ω): Enter the resistance if known.
Power (W): Enter the power if known.

Simply enter values into any two of the four fields and click “Calculate”. The calculator will automatically fill in the remaining two unknowns.

Practical Applications

Understanding these relationships is crucial for:

Circuit Design: Calculating the correct resistor size for LEDs, voltage dividers, or current limiting.
Troubleshooting: Identifying faulty components or unexpected current draws.
Power Consumption: Estimating the power usage of devices and circuits.
Safety: Ensuring components operate within their voltage, current, and power ratings to prevent overheating or damage.

By using this Resistor Calculator, you can quickly and accurately solve for various electrical parameters, making your electrical projects easier and safer.