Ideal and Real Capacitors: How their Behaviour Affect Energy Efficiencies

• Tipo: Capítulo ou Parte de Livro
• Data: 2012

Autores

Paulo Simeão Carvalho (Autor) FCUP; Adriano Sampaio e Sousa (Autor) FCUP

Livro

Título: Encyclopedia of Electrochemistry Research

Páginas: 41-57

Classificação Científica

FOS: Ciências exactas e naturais > Física

CORDIS: Ciências Físicas > Física

Outras Informações

Abstract (EN): Capacitors are generally considered “old fashioned” topics for scientific discussion. Classical treatment of these components tends to represent them as ideal components and forget their real behavior. Real capacitors are built by dielectrics with a finite resistance that result in a leakage electric current that affects the capacitor efficiency. In this work, we will focus our attention on how efficiency can be calculated and measured, giving alternative ways for the calculus of the time constant and the energies stored and supplied during charge and discharge processes in DC circuits, representing the electric power as a function of time in ideal and real capacitors. This will help to understand the difference between an ideal capacitor and a real one, and show why the efficiency of a real capacitor is always less than 50 %. Discussion about real capacitors will involve both DC circuits and AC circuits.

Idioma: Inglês

Tipo (Avaliação Docente): Científica