Réaktansi
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- Artikel ieu ngeunaan éléktronik. Keur artikel nu patali jeung "réaktif" atawa "réaktani" dina widang kimi, tempo réaktivitas.
- Keur sawala ngeunaan konsép psikologi réaktansi, tempo réaktansi (psikologi).
Dina analisis sirkuit listrik arus bulak-balik (contona sirkuit séri RLC), réaktansi mangrupakeun bagian imajinér tina impedansi, sarta disababkeun ku ayana induktor atawa kapasitor dina sirkuit. Réaktansi mangrupakeun komponén tina impedansi listrik kompléks sirkuit [[arus bulak-balik, nu ngahasilkeun fase antara arus listrik jeung voltase dina sirkuit. Réaktansi dilambangkeun X sarta diukur dina satuan ohm.
- Lamun X > 0, réaktansi disebut induktif.
- Lamun X = 0, sirkuit murni résistif, hartina teu miboga réaktansi.
- Lamun X < 0, disebut kapasitif.
Hubungan antara impedansi, résistansi, jeung réaktansi ditunjukkeun ku persamaan
dimana
- Z nyaéta impedansi dina ohm,
- R nyaéta résistansi dina ohm,
- X nyaéta réaktansi dina ohm,
- sarta j nyaéta unit imajinér
.
Sering ogé cukup ku ukur nganyahokeun gedéna impedansi:
Keur élemén nu murni induktif atawa kapasitif, gedéna impedansi dibasajankeun jadi ukur reaktansi.
Réaktansi ditunjukkeun ku
numana XL jeung XC nyaéta réaktansi induktif jeung kapasitif, patuturut.
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Artikel ieu keur dikeureuyeuh, ditarjamahkeun tina basa Inggris. Bantosanna diantos kanggo narjamahkeun. |
Inductive reactance (symbol XL) is caused by the fact that a current is accompanied by a magnetic field; therefore a varying current is accompanied by a varying magnetic field; the latter gives an electromotive force that resists the changes in current. The more the current changes, the more an inductor resists it: the reactance is proportional to the frequency (hence zero for DC). There is also a phase difference between the current and the applied voltage.
Inductive reactance has the formula
where
- XL is the inductive reactance, measured in ohms
- ω is the angular frequency, measured in radians per second
- f is the frequency, measured in hertz
- L is the inductance, measured in henries
Capacitive reactance (symbol XC) reflects the fact that electrons cannot pass through a capacitor, yet effectively alternating current (AC) can: the higher the frequency the better. There is also a phase difference between the alternating current flowing through a capacitor and the potential difference across the capacitor's electrodes.
Capacitive reactance has the formula
where
- XC is the capacitive reactance measured in ohms
- ω is the angular frequency, measured in radians per second
- f is the frequency, measured in hertz
- C is the capacitance, measured in farads
[édit] Référénsi
[1] Pohl R. W. Elektrizitätslehre. – Berlin-Gottingen-Heidelberg: Springer-Verlag, 1960.
[2] Popov V. P. The Principles of Theory of Circuits. – M.: Higher School, 1985, 496 p. (In Russian).
[3] Küpfmüller K. Einführung in die theoretische Elektrotechnik, Springer-Verlag, 1959.
[édit] Tempo ogé
- SI electromagnetism units
- Susceptance, the reciprocal of reactance.
- XC = Capacitive reactance: Opposition to Current.
- XL = Inductive reactance: Opposition to Voltage.