Double beam tube
... Record the anode voltage (V), the radius of the electron orbit (R) and the current in the coils (I) (Not to be confused with the anode current (IA). Measure the radius of the coils (r). The number of turns on each coil (N) should be marked on the coils. Repeat the values for a few different values o ...
... Record the anode voltage (V), the radius of the electron orbit (R) and the current in the coils (I) (Not to be confused with the anode current (IA). Measure the radius of the coils (r). The number of turns on each coil (N) should be marked on the coils. Repeat the values for a few different values o ...
nakuru district sec. schools trial examination – 2014
... 6. Figure 4 shows how rays from a distant and near object are focused inside a human eye with a certain defect. ...
... 6. Figure 4 shows how rays from a distant and near object are focused inside a human eye with a certain defect. ...
The applied field potential (E, volts) of electromagnetic radiation is
... path to the control circuits . unhealthy -even deadly- for humans, it is just what the magnetron tube needs to do its job -that is, to dynamically convert the high voltage in to undulating waves of electromagnetic cooking energy. The microwave energy is transmitted into a metal channel called a wave ...
... path to the control circuits . unhealthy -even deadly- for humans, it is just what the magnetron tube needs to do its job -that is, to dynamically convert the high voltage in to undulating waves of electromagnetic cooking energy. The microwave energy is transmitted into a metal channel called a wave ...
Cathode Rays
... connected to a high voltage source, an eerie glow appears to emanate from the cathode (i.e. the negative electrode). The nature of these “cathode rays” was a mystery for much of the latter half of the 19th century. In 1897 J.J. Thomson, working in the Cavendish laboratory at Cambridge, suggested tha ...
... connected to a high voltage source, an eerie glow appears to emanate from the cathode (i.e. the negative electrode). The nature of these “cathode rays” was a mystery for much of the latter half of the 19th century. In 1897 J.J. Thomson, working in the Cavendish laboratory at Cambridge, suggested tha ...
forward-biased
... • Feature common to both transistors and tubes is that they can amplify signals. • A triode vacuum tube might be used because instead of a transistor because it may be able to handle higher power. • Can amplify a small signal but must use high voltages (transistor doesn’t need high voltages) • Parts ...
... • Feature common to both transistors and tubes is that they can amplify signals. • A triode vacuum tube might be used because instead of a transistor because it may be able to handle higher power. • Can amplify a small signal but must use high voltages (transistor doesn’t need high voltages) • Parts ...
Superconducting RF Cavities for Particle
... • Superconducting RF (SRF) provides efficient, high-gradient accelerators at high duty-factor. • SRF accelerator cavities are a success story. • Large variety of SRF cavities, depending on: – Type of accelerator – Particle velocity – Current and Duty factor – Gradient – Acceleration or deflecting mo ...
... • Superconducting RF (SRF) provides efficient, high-gradient accelerators at high duty-factor. • SRF accelerator cavities are a success story. • Large variety of SRF cavities, depending on: – Type of accelerator – Particle velocity – Current and Duty factor – Gradient – Acceleration or deflecting mo ...
Unit 1-Electrical Energy
... – Atoms which gain electrons have more electrons and therefore are negative ...
... – Atoms which gain electrons have more electrons and therefore are negative ...
ELECTRICITY
... to create a voltage difference at an outlet (plug-in) wall socket – voltage difference across the two holes of an electrical outlet. when the circuit is “complete” or “something is plugged in,” the charge can move from high to low. ...
... to create a voltage difference at an outlet (plug-in) wall socket – voltage difference across the two holes of an electrical outlet. when the circuit is “complete” or “something is plugged in,” the charge can move from high to low. ...
Microwave Solid State Devices
... * Shot noise is proportional to the square of current therefore operate at moderate Ic. * Thermal noise is reduced at lower power levels. With interdigital base design Rb is low therefore lower voltage drop and less power. ...
... * Shot noise is proportional to the square of current therefore operate at moderate Ic. * Thermal noise is reduced at lower power levels. With interdigital base design Rb is low therefore lower voltage drop and less power. ...
electric current ppt
... • DC: flow of charge in one direction only batteries • AC: electrons vibrate back and forth; don’t actually flow through circuit • In USA, current alternates at 60 Hz with voltage of 120 V • AC can be transmitted for long distances with little loss due to heat ...
... • DC: flow of charge in one direction only batteries • AC: electrons vibrate back and forth; don’t actually flow through circuit • In USA, current alternates at 60 Hz with voltage of 120 V • AC can be transmitted for long distances with little loss due to heat ...
Cavity magnetron
The cavity magnetron is a high-powered vacuum tube that generates microwaves using the interaction of a stream of electrons with a magnetic field while moving past a series of open metal cavities (cavity resonators). Bunches of electrons passing by the openings to the cavities excite radio wave oscillations in the cavity, much as a guitar's strings excite sound in its sound box. The frequency of the microwaves produced, the resonant frequency, is determined by the cavities' physical dimensions. Unlike other microwave tubes, such as the klystron and traveling-wave tube (TWT), the magnetron cannot function as an amplifier, increasing the power of an applied microwave signal, it serves solely as an oscillator, generating a microwave signal from direct current power supplied to the tube.The first form of magnetron tube, the split-anode magnetron, was invented by Albert Hull in 1920, but it wasn't capable of high frequencies and was little used. Similar devices were experimented with by many teams through the 1920s and 30s. On November 27, 1935, Hans Erich Hollmann applied for a patent for the first multiple cavities magnetron, which he received on July 12, 1938, but the more stable klystron was preferred for most German radars during World War II. The cavity magnetron tube was later improved by John Randall and Harry Boot in 1940 at the University of Birmingham, England. The high power of pulses from their device made centimeter-band radar practical for the Allies of World War II, with shorter wavelength radars allowing detection of smaller objects from smaller antennas. The compact cavity magnetron tube drastically reduced the size of radar sets so that they could be installed in anti-submarine aircraft and escort ships.In the post-war era the magnetron became less widely used in the radar role. This was because the magnetron's output changes from pulse to pulse, both in frequency and phase. This makes the signal unsuitable for pulse-to-pulse comparisons, which is widely used for detecting and removing ""clutter"" from the radar display. The magnetron remains in use in some radars, but has become much more common as a low-cost microwave source for microwave ovens. In this form, approximately one billion magnetrons are in use today.