Capacitance and Dielectrics

Capacitance and Dielectrics

Introduction

A capacitor is a passive electrical component with the capability of electric charge and, related energy saving. The ability to charge to save is called electrical capacitance and referred to the unit farad measured. Capacitors act against changes in voltage due to their charge storage capability, while a coil opposes changes in current. The technical design of capacitors consists of two electrically conductive surfaces, usually in a small distance, the electrodes, also called condenser surfaces. There between is always an insulating region, a dielectric. In most designs, the electrodes and the dielectric can be rolled or is arranged as a (stack eeweb.com).

Discussion

Capacitors are widely used in electrical equipment and in virtually every electronic device used. You realize, for example, electrical energy storage, reactance or frequency-dependent resistors, special designs are used as sensors used. For special configurations nonlinear capacitors are known. A normal capacity is a capacitor with the highest absolute and relative capacitance stability against temperature changes and aging. In addition, it is normally the highest demands on the electrical performance over a wide operating frequency range, and the dielectric absorption of the dielectric used is less than a few microvolts required. Also thermal stresses are not wanted here. These calibration standards are capacity for calibration (adjustment) of high-quality instruments, as used, for example precision RLC bridges or are in these devices (physics.brocku.ca).

The capacitor owes its name to its ability to store electrical charges and energy. In general, the capacitor consists of two conductors, called reinforcements, placed at a certain distance. When the plates are connected to the poles of a battery (which produces a potential difference V) and load, a buy a charge + Q, the other a charge equal and opposite - Q. The greater the Q charge; the greater the capacity C of the ...