Determining the Equivalent Series Resistance of a Capacitor

Ceramic capacitors exhibit a lower equivalent series resistance (ESR) compared to electrolytic capacitors. As a result, the ceramic capacitor’s contribution to the total capacitance is minimal, but it plays a crucial role in determining the overall ESR. When comparing aspect ratios, it can be observed that electrolytic capacitors with taller cylindrical shapes and higher voltage […]

AC Circuit Capacitors: A Rephrased Discussion

The capacitor resists any alteration in the source voltage according to the standard capacitor equation, which states that Q = CV. As a result, the current through the capacitor is directly proportional to the rate of change of the applied voltage, as expressed by the equation I = C(dv/dt). When plotted against time, the capacitor […]

Choosing the Appropriate Voltage Rating for Capacitors: A Guide

The reason behind the formulae’s application does not require knowledge of its explanation, which delves into complex magic and obscure physical properties. However, it seems to be connected to the higher dissipation factor at higher frequencies and the heightened probability of internal corona discharge as the material’s thickness (or “effective thickness” at different frequencies) increases. […]

Identifying the Symbol Representing a Capacitor

The EIA practice in North America utilizes a parallel-line-and-curve symbol to represent non-polarized capacitors. In addition, they include a + polarity marker on the line side for polarized electrolytics. On the other hand, IEC/EN practice in Europe uses a two-line symbol for non-polarized capacitors and a line-and-box symbol with the box placed on the + […]

Resonant frequency and Resistance relationship in a series RLC circuit: A Rephrased Analysis

The question suggests the existence of multiple resonant frequencies. So, what are the other resonant frequencies and how can they be deduced? simulate this circuit – Schematic created using CircuitLab Solution 1: A simulation can be used as one method to determine the resonant frequencies. Question: I have a series RLC circuit and I have […]

Utilization of Non-Polarized Capacitors

Non-polarized capacitors are necessary in AC power feeds, and for safety purposes, they should be X or Y rated if connected to AC mains. When dealing with AC/RF signals that have no DC offset voltage, it is recommended to utilize non-polarized capacitors. Question: I have a great interest in capacitors, specifically the polarized capacitors type. […]