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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Thermistor ： ウィキペディア英語版 Thermistor A thermistor is a type of resistor whose resistance is dependent on temperature, more so than in standard resistors. The word is a portmanteau of ''thermal'' and ''resistor''. Thermistors are widely used as inrush current limiter, temperature sensors (NTC type typically), self-resetting overcurrent protectors, and self-regulating heating elements. Thermistors differ from resistance temperature detectors (RTDs) in that the material used in a thermistor is generally a ceramic or polymer, while RTDs use pure metals. The temperature response is also different; RTDs are useful over larger temperature ranges, while thermistors typically achieve a greater precision within a limited temperature range, typically −90 °C to 130 °C.〔("NTC Thermistors" ). Micro-chip Technologies. 2010.〕 ==Basic operation== Assuming, as a first-order approximation, that the relationship between resistance and temperature is linear, then: :$\backslash Delta\; R\; =\; k\backslash Delta\; T\; \backslash ,$ where :$\backslash Delta\; R$, change in resistance :$\backslash Delta\; T$, change in temperature :$k$, first-order temperature coefficient of resistance Thermistors can be classified into two types, depending on the classification of ''$k$''. If ''$k$'' is positive, the resistance increases with increasing temperature, and the device is called a positive temperature coefficient (PTC) thermistor, or posistor. If ''$k$'' is negative, the resistance decreases with increasing temperature, and the device is called a negative temperature coefficient (NTC) thermistor. Resistors that are not thermistors are designed to have a ''$k$'' as close to 0 as possible, so that their resistance remains nearly constant over a wide temperature range. Instead of the temperature coefficient ''k'', sometimes the ''temperature coefficient of resistance'' $\backslash alpha\_T$ (alpha sub T) is used. It is defined as〔(Thermistor Terminology ). U.S. Sensor〕 :$\backslash alpha\_T\; =\; \backslash frac\; \backslash frac.$ This $\backslash alpha\_T$ coefficient should not be confused with the $a$ parameter below. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Thermistor」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.