What is Electronics?

What is Electronics?

• Technics to use electrons in a required way is called electronics. The name might sound small but it is one big word which runs the world.

• We all know that electrons are from atoms, and an electron deficient atom will always try to get the required electrons to become neutralized.
• Electrons(from negative supply) move over the conductor towards the positive supply for its neutralization.
• These electrons movement is measured as current, current is indicated in opposite direction to the movement of electrons.
• Voltage is created because of the opposition of current flow in a conductor. 
• A high voltage between two points of a conductor indicates that there is an high amount of insulation between two points.
• If we connect a 5 Volts supply with 2Ah (which can give 2 ampere of current for an hour and then drain out of electrons) to the two ends of a wire one with positive and other with negative supply, various cases are shown as, 
• Case 1: If the conductor has zero resistance or insulation then 2 ampere will flow for one hour and then no flow of current after time = 1 hour.

• Case 2: Practically there will be some resistance for any conductor which will reduce the flow of current depending upon the conductor used.

• Case 3: If we use a resistor with specified value between the supply then flow of electrons controlled to our will ( but approximate due to various internal and external factors discussed later).

• So, this is what electronics is all about. Play with electrons as we play with a cricket ball( throw, hit and catch) with size as an odd factor between them.
• We play with electrons using Passive and Active devices.
• Passive devices - They consume current, it does not have source of its own, eg, resistor, inductor, capacitor etc.
• Active devices - They increase current or use the voltage only and don't dissipate or consume any of given input supply for the device, it has its own source of supply, eg, amplifier, Integrated Circuits (IC's), Liquid Crystal Display (LCD)etc.