Electrons in solids. and semiconductor devices

Light- and temperature-sensitive resistors

Light- and temperature-sensitive resistors Another method of voltage variation is to use sensors in place of one of the resistors. A light-dependent resistor (LOR) is sensitive to light. Fig. 45.5 shows one type. The LOR contains a semiconducting material, and when it is exposed to light its resistance changes. In the dark it has a high resistance value, …

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Electrons in solids. and semiconductor devices

Electrons in solids. and semiconductor devices ‘Electronics’ is the name given to the study of electron movement in gases, vacuo and semiconductors. Semiconductor devices, mainly transistors, are what we shall be dealing with in this chapter. Semiconductor devices of various kinds are used in a very wide range of electrical equipment: radios and televisions, tape recorders and alarm systems …

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