Question

Why it is necessary to use

filters after converting AC into DC?​

Answer 1

Answer:

In a power supply system involving ac to dc voltage conversion, a filter blocks ac components while allowing dc components to flow through the load. The presence of a filter helps to minimize the number of ac components that flow through the load.

Answer 2

$\small \rm \pink{the \: role \: of \: capacitors \: in \: ac \: filters \: circuits}$

Most electronic devices are not designed to use voltage in ac form. A rectifier circuit is used to convert ac voltage to dc form. The voltage coming from a rectifier has unwanted ac components, and it is necessary to remove them. Removing these components from the rectified voltage helps to improve the overall performance of an electronic circuit. In order to achieve that, a smoothening component or circuit, usually known as a filter, is added after the rectifier. In this article, we will explore some of the most common filtering circuits and the important role that capacitors play in them.

$\small \rm \pink{rectifier \: circuits}$

Before we dive into the operation of filter circuits, it is important that we understand how rectifiers work and the outputs they produce. The two most common types of rectifiers are shown in Figure 1 and Figure 2. The outputs produced by the two circuits are as shown in Figure 3 and Figure 4 respectively. The ac components present in the two outputs are undesirable, and filter circuits are used to remove them.