Titlebook: Mastering Electronics; John Watson Textbook 1990Latest edition John Watson 1990 arithmetic.computer.General Certificate of Secondary Educa

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Passive components and power suppliesnents use the movement of electrons either through a vacuum or through a semiconductor to perform some function in the circuit. Passive devices, on the other hand, do not control the movements of the electrons, but rather allow the electrons to flow through them. It could be argued that the simplest of all passive devices is a length of wire!

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Optoelectronicsaced the valve with the transistor, and subsequently complex transistor circuits with integrated circuits, produced an increase in the number and types of devices combining light and electronics. The term ‘optoelectronic’ came into use as a description for what has now become a large and important branch of electronics technology.

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