The charge to mass ratio of the electron - Workspace
... The experimental strategy should be clear: you can control U through the voltage applied to the electron source and B through the current in the Helmholtz coils. By measuring the radius r for different values of these parameters you can determine the charge to mass ratio of the electron. ...
... The experimental strategy should be clear: you can control U through the voltage applied to the electron source and B through the current in the Helmholtz coils. By measuring the radius r for different values of these parameters you can determine the charge to mass ratio of the electron. ...
Single-Phase Transformers - Electrical and Computer Engineering
... As can be seen, primary taps at 120-V and 208-V are available using terminals H2-H3 and H4 respectively. In low-power single-phase residential applications, 120-V is a common voltage level. This is typically obtained by splitting a 240-V winding. Alternatively, 120-V can be obtained from the line-to ...
... As can be seen, primary taps at 120-V and 208-V are available using terminals H2-H3 and H4 respectively. In low-power single-phase residential applications, 120-V is a common voltage level. This is typically obtained by splitting a 240-V winding. Alternatively, 120-V can be obtained from the line-to ...
CBSE/12th Class/2010/PHYSICS S.No Questions Answers
... the ground. Space Waves, also known as direct waves, are radio waves that travel directly from the transmitting antenna to the receiving antenna. In order for this to occur, the two antennas must be able to “see” each other; that is there must be a line of sight path between them. ...
... the ground. Space Waves, also known as direct waves, are radio waves that travel directly from the transmitting antenna to the receiving antenna. In order for this to occur, the two antennas must be able to “see” each other; that is there must be a line of sight path between them. ...
Speaker Re-foaming (Surround Replacement)
... voice coil if it scrapes the edges of the gap. A surround that is entirely torn should result in a completely non-functional speaker. Another reason to replace the surround, before any damage has occurred, is material deterioration such as stiffening. If the surround becomes brittle or stiff, it can ...
... voice coil if it scrapes the edges of the gap. A surround that is entirely torn should result in a completely non-functional speaker. Another reason to replace the surround, before any damage has occurred, is material deterioration such as stiffening. If the surround becomes brittle or stiff, it can ...
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.