LIGHT BULB - IYPT Archive
... Inherently, the idea is that bulb glows because of the electromagnetic radiation of it. This idea is scientifically based on such definitions as radiant emission R, which shows the energy radiated per time per surface area. And when one is considering spectral density of radiant emittance r (dependa ...
... Inherently, the idea is that bulb glows because of the electromagnetic radiation of it. This idea is scientifically based on such definitions as radiant emission R, which shows the energy radiated per time per surface area. And when one is considering spectral density of radiant emittance r (dependa ...
Itenberg_Piezoelectrics_USB_handheld_HW5
... In addition, the relationship among the conversion efficiency, electrically induced damping and ac–dc power output is established explicitly. The researchers show that the conversion efficiency is dependent on the frequency ratio, the normalized resistance and, in particular, the ratio of the electr ...
... In addition, the relationship among the conversion efficiency, electrically induced damping and ac–dc power output is established explicitly. The researchers show that the conversion efficiency is dependent on the frequency ratio, the normalized resistance and, in particular, the ratio of the electr ...
applied voltage test system for transformers
... APPLIED VOLTAGE TEST SYSTEM FOR TRANSFORMERS TECHNICAL PARAMETERS Standard test systems are available for test voltages up to 360 kV and test currents up to 5 A [see table 1]. If required, two reactors can be combined in series or parallel to achieve higher test voltages or higher testing power. Th ...
... APPLIED VOLTAGE TEST SYSTEM FOR TRANSFORMERS TECHNICAL PARAMETERS Standard test systems are available for test voltages up to 360 kV and test currents up to 5 A [see table 1]. If required, two reactors can be combined in series or parallel to achieve higher test voltages or higher testing power. Th ...
coupling and decoupling secondary dq currents based brushless
... functions (8, 9). For example it can operate as conventional induction machine by simply shorting the secondary winding even such action protect the control side in the case of inverter failure. Currently, this mode is used to start the machine which was also followed in the laboratory work. A secon ...
... functions (8, 9). For example it can operate as conventional induction machine by simply shorting the secondary winding even such action protect the control side in the case of inverter failure. Currently, this mode is used to start the machine which was also followed in the laboratory work. A secon ...
GE Control Catalog - Section 3: Lighting Contactors
... 1. 3 wire control is the choice for use with momentary devices allowing operation from multiple locations —a momentary pulse of energy operates contactor; a second pulse on alternate leg returns contactor to original state 2. 2-wire control is the choice for single-output automatic operation or for ...
... 1. 3 wire control is the choice for use with momentary devices allowing operation from multiple locations —a momentary pulse of energy operates contactor; a second pulse on alternate leg returns contactor to original state 2. 2-wire control is the choice for single-output automatic operation or for ...
Voltage conversion ratios for switched-capacitor
... not pose problems for magnetics design, construction nor ...
... not pose problems for magnetics design, construction nor ...
Resonant inductive coupling
Resonant inductive coupling or electrodynamic induction is the near field wireless transmission of electrical energy between two magnetically coupled coils that are part of resonant circuits tuned to resonate at the same frequency. This process occurs in a resonant transformer, an electrical component which consists of two high Q coils wound on the same core with capacitors connected across the windings to make two coupled LC circuits. Resonant transformers are widely used in radio circuits as bandpass filters, and in switching power supplies. Resonant inductive coupling is also being used in wireless power systems. Here the two LC circuits are in different devices; a transmitter coil in one device transmits electric power across an intervening space to a resonant receiver coil in another device. This technology is being developed for powering and charging portable devices such as cellphones and tablet computers at a distance, without being tethered to an outlet.Resonant transfer works by making a coil ring with an oscillating current. This generates an oscillating magnetic field. Because the coil is highly resonant, any energy placed in the coil dies away relatively slowly over very many cycles; but if a second coil is brought near it, the coil can pick up most of the energy before it is lost, even if it is some distance away. The fields used are predominately non-radiative, near fields (sometimes called evanescent waves), as all hardware is kept well within the 1/4 wavelength distance they radiate little energy from the transmitter to infinity.One of the applications of the resonant transformer is for the CCFL inverter. Another application of the resonant transformer is to couple between stages of a superheterodyne receiver, where the selectivity of the receiver is provided by tuned transformers in the intermediate-frequency amplifiers. The Tesla coil is a resonant transformer circuit used to generate very high voltages, and is able to provide much higher current than high voltage electrostatic machines such as the Van de Graaff generator. Resonant energy transfer is the operating principle behind proposed short range (up to 2 metre) wireless electricity systems such as WiTricity or Rezence and systems that have already been deployed, such as Qi power transfer, passive RFID tags and contactless smart cards.