Potência Dissipada Resistor
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
P = I²R
About this calculator
The Resistor Power Dissipation Calculator is an online tool that helps calculate the power dissipated by a resistor in an electric circuit. Using the formula P = I²R, where P is the power dissipated, I is the electric current and R is the electric resistance, this calculator allows you to input the values of these parameters and obtain the result instantly.
This calculator is useful when you need to calculate the power dissipated by a resistor in an electric circuit, especially in applications involving electronic circuits, such as circuit analysis, electronic device design and practical problem-solving related to electronics.
To use this calculator, simply input the values of the electric current (I) and electric resistance (R) and press the 'Calculate' button. The result will be presented in watts (W). Be sure to consider common precautions when working with electric circuits, such as safety and electric shock prevention.
Additionally, it's essential to remember that this calculator is only a tool to assist in problem-solving. It's always recommended to consult the theory and practice of electronics to ensure that calculations are correct and safe.
Frequently asked questions
What is the power dissipated by a resistor?
The power dissipated by a resistor is the amount of energy that is converted into heat when the electric current flows through the resistor. This occurs because the electric resistance of the resistor opposes the flow of electric current, generating heat as a result.
Why is it important to calculate the power dissipated by a resistor?
Calculating the power dissipated by a resistor is important because it helps to prevent damage to the resistor and other circuit components, while also ensuring safety when working with electric circuits.
What happens if the power dissipated is too high?
If the power dissipated is too high, the resistor may overheat and suffer damage, which can lead to malfunctioning or even fires. It is essential to take measures to reduce the power dissipated or choose a resistor with suitable resistance.
Can I use this calculator to calculate the power dissipated by other components?
No, this calculator is specific to calculating the power dissipated by resistors. If you need to calculate the power dissipated by other components, such as diodes or transistors, you will need to use a different calculator.