Function of Capacitor


A capacitor contains electrodes, which consist of two metal plates or metal films that face each other. An insulator (or a dielectric substance), which can be made of various materials, is placed between the electrodes. (In the diagram, air acts as an insulator.)
When voltage is applied to both electrodes by connecting the positive and negative terminals of a battery, the facing electrodes will become positively and negatively charged.
The electric charges will remain even after the power source has been disconnected, as the capacitor has a charging effect. When the electrodes of a charged capacitor are shorted, there will be a momentary flow of current, and the stored charge will become neutralized and disappear. Thus, the capacitor is discharged. Read more Function of Capacitor

Fundamentals of Automotive electricity

Electrical Circuit

Electrical devices are used in numerous areas of an automobile, and provide various functions.
As electricity passes through a resistor, it affects the resistor and can provide a number of functions.
Electrical devices utilize those functions according to purpose by converting electricity into work.
Functions of electricity
1. Heat-generation function
Heat is generated as electricity passes through a resistor, such as a cigarette lighter, fuse.
2. Light-emitting function
Light is emitted as electricity passes through a resistor, such as a light bulb. Read more Fundamentals of Automotive electricity