Electrical inducttion
... • Electrical energy comes from a power plant with huge generators. • The coils in these generators have many coils of wire wrapped around huge iron cores. • The rotating magnets are connected to a turbine (TUR bine)a large wheel that rotates when pushed by water, ...
... • Electrical energy comes from a power plant with huge generators. • The coils in these generators have many coils of wire wrapped around huge iron cores. • The rotating magnets are connected to a turbine (TUR bine)a large wheel that rotates when pushed by water, ...
213Lab11-transformer
... A transformer is a device that changes the AC voltage and current. It works based on the electromagnetic induction principles, and consists of 2 coils: the primary coil and the secondary coil. Primary coil is connected to an AC power supply. The coil has a ferromagnetic core that enhances the magnet ...
... A transformer is a device that changes the AC voltage and current. It works based on the electromagnetic induction principles, and consists of 2 coils: the primary coil and the secondary coil. Primary coil is connected to an AC power supply. The coil has a ferromagnetic core that enhances the magnet ...
Summary presentation 12.2 alternating currents File
... We could use the peak value, but this occurs only for a moment. What about the average value? This is zero over a complete cycle and so is not very helpful! ...
... We could use the peak value, but this occurs only for a moment. What about the average value? This is zero over a complete cycle and so is not very helpful! ...
Ignition system lecture
... edge of the magnets the flywheel reaches the trigger coil, a second small current is induced in the trigger coil and that current tells the transistor to "turn off", effectively breaking the circuit of the primary winding to ground (Figure 3), the sudden break causes the magnetic field to collapse. ...
... edge of the magnets the flywheel reaches the trigger coil, a second small current is induced in the trigger coil and that current tells the transistor to "turn off", effectively breaking the circuit of the primary winding to ground (Figure 3), the sudden break causes the magnetic field to collapse. ...
Transformers AM326 KB
... allows the power supply to drive a current round the coil. The current is driven round a number of turns, producing a flux. The gimballed bar magnet shows this flux. As yet the magnetic circuit is not well defined by a region of low permeance, so is much more diffuse. ...
... allows the power supply to drive a current round the coil. The current is driven round a number of turns, producing a flux. The gimballed bar magnet shows this flux. As yet the magnetic circuit is not well defined by a region of low permeance, so is much more diffuse. ...
Transformers Safety
... Explain what causes physical vibrations in transformers at twice the frequency of the AC power involved. ...
... Explain what causes physical vibrations in transformers at twice the frequency of the AC power involved. ...
Wireless Power Transfer System Using Magnetic Resonant Coupling
... may provide a relatively strong influence on electric field coupling. Magnetic field coupling may be preferred, since extraneous objects in a magnetic field have the same magnetic properties as empty space. Electromagnetic induction method has short range. Since magnetic field coupling is a non-radi ...
... may provide a relatively strong influence on electric field coupling. Magnetic field coupling may be preferred, since extraneous objects in a magnetic field have the same magnetic properties as empty space. Electromagnetic induction method has short range. Since magnetic field coupling is a non-radi ...
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.