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Three reasons.
1...There are cases where you can't get there from here...there is no way to get a connection from a point to another point without jumping over another trace, so an insulated wire jumper is used.
2...Someone goofed up and a circuit correction must be made. This is done by cutting traces and adding jumpers. Sometimes ICs are "dead-bugged" (Glued on upside down) onto the circuit card.
3...Sometimes a circuit card must work while interfacing with different external circuits, so jumpers are added or removed to permit different interfaces.
Many times jumpers are supplied as zero ohm resistors (3 black rings) so that they can be installed by a pick-and-place machine.
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What is the use of a track cutter?
Cuts copper traces of printed circuit boards to allow changes.
What you can do after degree in electronics and telecommunications?
You could go into teaching or you could get a job manufacturing circuits/circuit boards.
Why are circuit boards green?
That is just the conventional color of the insulating varnish "mask" used to protect the board. It could be a different color, but green was selected as it contrasts well with copper traces allowing them to be seen through the "mask". Up until the late 1950's, circuit boards were usually brown in color. The brown boards had no "mask" on them, the traces were protected with solder dip. Brown is the color of the paper-epoxy or paper-phenolic board material used.
What is the lifetime of printed circuit board?
Depends on the material it's constructed from, the application for which it's being used and the atmospherics to which it's exposed. I have printed circuit boards from the very first model of an RCA transistor radio made in 1957 and the circuit board as well as the electronics still work.
What can printed circuit boards be used for?
PCB or printed circuit board are copper clad that are chemically etched to establish connections with parts installed on it making it a working circuit Today, just about every electronic appliance in your home contains a printed circuit board of some type: computers, printers, televisions, stereos, musical instrument amplifiers and synthesizers, digital clocks, microwave ovens, telephone answering machines and even cell phones. The "motherboard" in a computer is the main printed circuit board that is the heart of a computer. Other circuit boards inside a computer performs functions such as RAM (random access memory), power supplies, modems and video "cards."
