Self-Induction definition of Self-Induction in the Free Online Encyclopedia.

self-induction [¦self in¦dək·shən]

(electromagnetism)

The production of a voltage in a circuit by a varying current in that same circuit.

Self-Induction

the appearance of an electromotive force (emf) of induction in a conducting circuit when the current in the circuit changes. This phenomenon is a special case of electromagnetic induction. The current change in the circuit causes a change in the magnetic flux through the surface enclosed by the circuit. As a result, an emf—the emf of self-induction—is induced in the circuit. The direction of the emf is determined by Lenz’s law: if the current in the circuit increases, the emf of self-induction opposes this increase; if the current decreases, the emf opposes the decrease. Thus, self-induction is similar to the phenomenon of inertia in mechanics. The emf of self-induction e_L is proportional to the rate of change of the current i and to the self-inductance L of the circuit: e_L = - Ldi/dt.

Because of self-induction, the closing of an electric circuit containing a constant emf does not instantaneously establish a steady current; the current is established only after a certain time interval (see TRANSIENT). Similarly, when the circuit is opened, the current flow does not cease instantaneously. The emf of self-induction that is induced by the opening of the circuit can be several times greater than the emf of the source. In AC circuits, the emf of self-induction causes the current in an inductance coil to lag in phase behind the voltage across the ends of the coil by (see ALTERNATING CURRENT).

The phenomenon of self-induction plays an important role in electrical engineering and radio engineering. Self-induction causes the recharging of a capacitor connected in series with an inductance coil (see OSCILLATORY CIRCUIT); as a result, natural electromagnetic oscillations are established in the circuit.

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No references found			Many of the women (75%) who attempted self-induction and failed, were then medically induced. Listening to Mothers II: reflections of an experienced birth ... by Cassel, Susan / Special Delivery 5%); loss of self-esteem (9%), and self-induction of seizures (7%). Seizure control stems other problems by Sullivan, Michele G. / Clinical Psychiatry News In cases of self-induction, psychological counseling might be of benefit. Pneumoparotid: A case report and review of its pathogenesis, ... by Misko, Glen / Ear, Nose and Throat Journal			self-fields Self-Financing self-finished roofing felt self-fluxing alloy self-focusing self-focusing fiber Self-Focusing of Light self-fulfilling prophecy self-furring self-furring nail Self-Government self-hardening steel self-heal self-healing dielectric breakdown self-healing network Self-Heating self-help group Self-Identical Truth self-ignition temperature self-impedance self-incompatibility self-incrimination self-induced transparency self-induced vibration self-inductance Self-Induction Self-Learning System self-leveling sealant self-loading self-locking nut self-locking screw Self-Motion self-noise self-optimizing communications Self-Organization self-organized criticality self-organizing function Self-Organizing System Self-Oscillations Self-Perfecting self-phase modulation self-poisoning Self-Pollination Self-Portrait self-powered hub self-propelled Self-Propelled Artillery Self-Propelled Chassis Self-Propelled Gun Self-Propelled Welder self-pulsing			self-incriminating self-incrimination self-incrimination self-incrimination Self-Incrimination Clause Self-Incrimination Clause self-incriminatory self-incriminatory self-incriminatory Self-Indicating Instant Radiation Alert Dosimeter Self-indignation self-induced Self-Induced Disease Self-Induced Disease Self-Induced Disease Self-Induced Disorder Self-Induced Disorder Self-Induced Disorder Self-Induced Illness Self-Induced Illness Self-Induced Illness Self-Induced Sickness Self-Induced Sickness Self-Induced Sickness self-induced transparency self-induced vibration self-inductance self-inductance self-inductances self-inductances Self-Induction self-inductive self-inductive self-indulgence self-indulgences self-indulgent self-indulgently self-inflicted Self-Inflicted Disease Self-Inflicted Disease Self-Inflicted Disease Self-Inflicted Disorder Self-Inflicted Disorder Self-Inflicted Disorder Self-Inflicted Illness Self-Inflicted Illness Self-Inflicted Illness Self-Inflicted Injuries Self-inflicted injury Self-inflicted injury Self-inflicted injury Self-Inflicted Injury Severity Form Self-Inflicted Sickness Self-Inflicted Sickness Self-Inflicted Sickness self-inflicted trauma self-inflicted trauma self-inflicted trauma Self-inflicted violence Self-inflicted violence Self-Inflicted Wounds

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Self-Induction