What is Electronics ?
The branch of engineering which deals with current conduction through a vacuum or gas or semiconductor is known as electronics.
Electronics essentially deals with electronic devices and their utilization.
An electronic device is that in which current flows through a vacuum or gas or semiconductor.
Importance of Electronics
Electronics has gained much importance due to its numerous applications in industry.
The electronic devices are capable of performing the following functions :
(i) Rectification :
The conversion of a.c. into d.c. is called rectification.
Electronic devices can convert a.c. power into d.c. power with very high efficiency. This is shown in fig.1 below.
This d.c. supply can be used for charging storage batteries, field supply of d.c. generators, electroplating etc.
(ii) Amplification :
The process of raising the strength of a weak signal is known as amplification.
Electronic devices can accomplish the job of amplification and thus act as amplifiers as shown in fig.2 below.
The amplifiers are used in a wide variety of ways. For example, an amplifier is used in a radio set where the weak signal is amplified so that it can be heard loudly. Similarly, amplifiers are used in public address system, television etc.
(iii) Control :
Electronic devices find wide applications in automatic control. For example, speed of a motor, voltage across a refrigerator etc. can be automatically controlled with the help of such devices.
Electronic devices can convert d.c. power into a.c. power of any frequency as shown in Fig. 3 below.
When performing this function, they are known as oscillators. The oscillators are used in a wide variety of ways. For example, electronic high frequency heating is used for annealing and hardening.
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