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泰亨利 (TH) 單位定義
The terahenry is a multiple of the unit henry (H) for inductance. The International System of Units (SI) defines the prefix tera (T) as a factor of 1012 or 1000000000000. Per this definition, one terahenry is 1012 henry. The terahenry is represented by the symbol TH.
概述
The inductance of an electric circuit is one henry when an electric current that is changing at one ampere (A) per second (s) results in an electromotive force of one volt (V) across the inductor: V(t) = L dI⁄dt, where V(t) denotes the resulting voltage across the circuit, I(t) is the current through the circuit, and L is the inductance of the circuit.
The henry is a derived unit based on four of the seven base units of the International System of Units: kilogram (kg), meter (m), second (s), and ampere (A). Expressed in combinations of SI units, the henry is: H = kg∙m2⁄s2∙A2 = N∙m⁄A2 = kg∙m2⁄C2 = J⁄A2 = T∙m2⁄A = Wb⁄A = V∙s⁄A = s2⁄F = Ω⁄Hz = Ω∙s. Where: H = henry, kg = kilogram, m = meter, s = second, A = ampere, N = newton, C = coulomb, J = joule, T = tesla, Wb = weber, V = volt, F = farad, Ω = ohm, Hz = hertz.
利用
國際單位制 (SI) 規定以首字母大寫的人命名的單位符號,而該名稱在句子文本中不大寫,除非該位置的任何單詞大寫,例如 at使用標題大小寫的句子或材料的開頭。美國國家標準與技術研究所建議用英語寫作的用戶使用複數作為 henries。
應用
The inductance of a coil depends on its size, the number of turns, and the permeability of the material within and surrounding the coil. Formulas can be used to calculate the inductance of many common arrangements of conductors, such as parallel wires, or a solenoid. A small air-core coil used for broadcast AM radio tuning might have an inductance of a few tens of microhenries (μH). A large motor winding with many turns around an iron core may have an inductance of hundreds of henries. The physical size of an inductance is also related to its current carrying and voltage withstand ratings.
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來源
“Henry (Unit).” Wikipedia, Wikimedia Foundation, 23 Jan. 2021, en.wikipedia.org/wiki/Henry_(unit).