Potência Média AC
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The AC Average Power Calculator is an online tool that calculates the average power in alternating current (AC) circuits. It uses the formula P = V_rms·I_rms·cosφ, where P is the average power, V_rms is the root mean square voltage, I_rms is the root mean square current, and cosφ is the power factor. This calculation is essential to understand the performance of electrical systems and ensure energy efficiency.
The formula used takes into account the root mean square voltage and current, which are measures of voltage and current that produce the same average power in a resistive load. The power factor, cosφ, is a measure of the circuit's efficiency, ranging from 0 to 1. The closer to 1, the more efficient the circuit. With these values, the calculator provides the average power consumed by the circuit.
It is important to use this calculator in situations where it is necessary to evaluate the energy consumption of electrical equipment, such as motors and transformers. It is also useful in electrical installation projects to ensure that the components are suitable for the expected load. Additionally, it helps to identify energy efficiency problems, allowing corrective measures to be taken.
When using the calculator, it is essential to be careful with the units of measurement and ensure that the entered values are accurate. The root mean square voltage and current must be in the same unit (usually volts and amperes), and the power factor must be a value between 0 and 1. With these precautions, it is possible to obtain accurate and useful results for analysis and design of electrical systems.
Frequently asked questions
What is AC average power?
The AC average power is the measure of the electrical power consumed by an alternating current circuit over a given period. It is calculated using the formula P = V_rms·I_rms·cosφ.
What is the importance of the power factor?
The power factor, cosφ, is a measure of the circuit's efficiency. The closer to 1, the more efficient the circuit, which means there is less energy loss.
How to use the AC average power calculator?
Just enter the values of root mean square voltage (V_rms), root mean square current (I_rms), and power factor (cosφ) into the calculator. It will provide the average power consumed by the circuit.
What are the units of measurement used?
The units of measurement used are volts (V) for the root mean square voltage, amperes (A) for the root mean square current, and a dimensionless value (between 0 and 1) for the power factor.