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Theory- 34 :- UPS - Working Principle

Theory - 33 :- PCMCIA Card

Theory - 30 :- How Speaker Works

Theory -29 :- Sound Cards & Its Connectors and Components

Theory- 27 :- What is a Sound Card?

Theory - 26 :- Major Components of a Projector/RPTV Lamp

Theory -25 :- How Projector Works?