TAP 414- 6: Quick demonstrations of electromagnetic induction
... Set the oscilloscope to a sensitive setting. Use yourself as an aerial to detect mains frequency! Connect yourself to a cathode ray oscilloscope by holding a lead inserted into the Y INPUT socket. Put your other hand near to or around an insulated mains cable that has a current flowing through it. ( ...
... Set the oscilloscope to a sensitive setting. Use yourself as an aerial to detect mains frequency! Connect yourself to a cathode ray oscilloscope by holding a lead inserted into the Y INPUT socket. Put your other hand near to or around an insulated mains cable that has a current flowing through it. ( ...
High Voltage Engineering (H.V)
... The low-voltage winding(L) of each upper stage is fed from an excitation winding (E) in the stage immediately below it. The L and E windings are therefore rated at currents higher than those of the H windings; the excitation windings at the lower stages evidently carry higher loading than those of t ...
... The low-voltage winding(L) of each upper stage is fed from an excitation winding (E) in the stage immediately below it. The L and E windings are therefore rated at currents higher than those of the H windings; the excitation windings at the lower stages evidently carry higher loading than those of t ...
Review Sheet 4 – Physics 222 – Fall 2016 – RHC The test will cover
... The Lorentz Force on Charge Law, The Lorentz Force on Current Law.. Determining a Lorentz Force direction and magnitude. Problems involving Lorentz and Ampere. Using magnetic flux density to determine the direction of a Lorentz Force. 3. Electromagnetic Induction (33), AC and Solid State Faraday’s L ...
... The Lorentz Force on Charge Law, The Lorentz Force on Current Law.. Determining a Lorentz Force direction and magnitude. Problems involving Lorentz and Ampere. Using magnetic flux density to determine the direction of a Lorentz Force. 3. Electromagnetic Induction (33), AC and Solid State Faraday’s L ...
magnetically coupled circuit
... magnetic field generated by one of them, it called magnetically coupled. Example: transformer An electrical device designed on the basis of the concept of magnetic coupling. Used magnetically coupled coils to transfer energy from one circuit to another. ...
... magnetic field generated by one of them, it called magnetically coupled. Example: transformer An electrical device designed on the basis of the concept of magnetic coupling. Used magnetically coupled coils to transfer energy from one circuit to another. ...
Highly Resonant Wireless Power Transfer: Safe, Efficient, and over
... used here to efficiently couple energy from the resonator to the load. It may transform the actual load impedance into an effective load impedance seen by the device resonator which more closely matches the loading for optimum efficiency (Equation 5). For loads requiring a DC voltage, a rectifier co ...
... used here to efficiently couple energy from the resonator to the load. It may transform the actual load impedance into an effective load impedance seen by the device resonator which more closely matches the loading for optimum efficiency (Equation 5). For loads requiring a DC voltage, a rectifier co ...
Test - Yu Chun Keung Memorial College No. 2
... (a) The voltage source is now adjusted at constant frequency until half the original current flows in the primary. In the space below copy the original waveform shown above and then draw the new waveform. (Assume the triggering remains the same.) Explain your reasoning. (b) The voltage source is now ...
... (a) The voltage source is now adjusted at constant frequency until half the original current flows in the primary. In the space below copy the original waveform shown above and then draw the new waveform. (Assume the triggering remains the same.) Explain your reasoning. (b) The voltage source is now ...
em 1 cat 2 set 1
... (ii)A 4-pole, lap-wound dc machine has 728 armature conductors. Its field winding is excited from a dc source to create an air-gap flux of 32 m Wb/pole. The machine (generator) is run from a prime mover (diesel engine) at 1600 rpm. It supplies a current of 100 A to an electric load. (1) Calculate t ...
... (ii)A 4-pole, lap-wound dc machine has 728 armature conductors. Its field winding is excited from a dc source to create an air-gap flux of 32 m Wb/pole. The machine (generator) is run from a prime mover (diesel engine) at 1600 rpm. It supplies a current of 100 A to an electric load. (1) Calculate t ...
Flux Density Test (Gaussmeter) Total Flux Test (Fluxmeter)
... The total flux output of a magnet can be obtained using a Fluxmeter connected to a Helmholtz coil. As shown in pic. 1, the coil is actually a pair of coils with a known number of turns and at a certain distance from each other. The resulting data (mVs, Weber, Maxwells) can be interpolated to obtain ...
... The total flux output of a magnet can be obtained using a Fluxmeter connected to a Helmholtz coil. As shown in pic. 1, the coil is actually a pair of coils with a known number of turns and at a certain distance from each other. The resulting data (mVs, Weber, Maxwells) can be interpolated to obtain ...
power_point1..metal_detector..final1_
... the time it takes for a target signal to decay can vary because of the size, shape, and chemical makeup of the object ,two ways forDiscrimination Many PI's rely on the ability of an adjustable delay whereby the operator can simply adjust the delay longer to see if an object is a piece of gold or n ...
... the time it takes for a target signal to decay can vary because of the size, shape, and chemical makeup of the object ,two ways forDiscrimination Many PI's rely on the ability of an adjustable delay whereby the operator can simply adjust the delay longer to see if an object is a piece of gold or n ...
Hewitt/Lyons/Suchocki/Yeh, Conceptual Integrated Science
... • Almost all electric energy sold today is in the form of ac because of the ease with which it can be transformed from one voltage to another. • Large currents in wires produce heat and energy losses, so power is transmitted great distances at high voltages and low currents. • Power is generated at ...
... • Almost all electric energy sold today is in the form of ac because of the ease with which it can be transformed from one voltage to another. • Large currents in wires produce heat and energy losses, so power is transmitted great distances at high voltages and low currents. • Power is generated at ...
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.