Transition state theory: Difference between revisions
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'''[[Inductance]]''' is a measure of the amount of [[magnetic flux]] produced for a given [[electric current]]. The term was coined by [[Oliver Heaviside]] in February [[1886]]. The [[SI]] unit of inductance is the [[Henry (unit)|henry]] (symbol: H), in honour of [[Joseph Henry]]. The symbol ''L'' is used for inductance, possibly in honour of the physicist [[Heinrich Lenz]]. | |||
The inductance has the following relationship: | |||
:<math>L= \frac{\Phi}{i}</math> | |||
where; ''L'' is the inductance in [[Henry (unit)|henrys]], ''i'' is the current in [[ampere]]s, ''Φ'' is the magnetic flux in [[Weber (unit)|weber]]s. Strictly speaking, the quantity just defined is called ''self-inductance'', because the magnetic field is created solely by the conductor that carries the current. | |||
When a conductor is coiled upon itself N number of times around the same axis (forming a [[solenoid]]), the current required to produce a given amount of flux is reduced by a factor of N compared to a single turn of wire. Thus, the inductance of a coil of wire of N turns is given by: | |||
:<math>L= \frac{\lambda}{i} = N\frac{\Phi}{i}</math> | |||
where, <math>\lambda</math> is the total 'flux linkage'. | |||
[[zh:Portal:電子學/特色条目/9]] | |||
Revision as of 19:43, 22 April 2013
Inductance is a measure of the amount of magnetic flux produced for a given electric current. The term was coined by Oliver Heaviside in February 1886. The SI unit of inductance is the henry (symbol: H), in honour of Joseph Henry. The symbol L is used for inductance, possibly in honour of the physicist Heinrich Lenz.
The inductance has the following relationship:
where; L is the inductance in henrys, i is the current in amperes, Φ is the magnetic flux in webers. Strictly speaking, the quantity just defined is called self-inductance, because the magnetic field is created solely by the conductor that carries the current.
When a conductor is coiled upon itself N number of times around the same axis (forming a solenoid), the current required to produce a given amount of flux is reduced by a factor of N compared to a single turn of wire. Thus, the inductance of a coil of wire of N turns is given by: