3B SCIENTIFIC® PHYSICS
... • Do not subject the connection leads to any tension. • The tube may only be used with tube holder D (U19100). If voltage or current is too high or the cathode is at the wrong temperature, it can lead to the tube becoming destroyed. • Do not exceed the stated operating parameters. • Only change circ ...
... • Do not subject the connection leads to any tension. • The tube may only be used with tube holder D (U19100). If voltage or current is too high or the cathode is at the wrong temperature, it can lead to the tube becoming destroyed. • Do not exceed the stated operating parameters. • Only change circ ...
Organic Light-Emitting Diodes
... An OLED is an electronic device made by placing a series of organic thin films between two conductors. When electrical current is applied, a bright light is emitted. A device that is 100 to 500 nanometers thick or about 200 times smaller than a human hair. ...
... An OLED is an electronic device made by placing a series of organic thin films between two conductors. When electrical current is applied, a bright light is emitted. A device that is 100 to 500 nanometers thick or about 200 times smaller than a human hair. ...
Electric charge and current
... When an electric current flows electrical energy is converted to other forms of energy such as heat, light, chemical, magnetic and so on. We will now look more closely at the nature of an electric current. Consider a piece of metal wire - a very much enlarged view of which is shown in Figure 1 . ato ...
... When an electric current flows electrical energy is converted to other forms of energy such as heat, light, chemical, magnetic and so on. We will now look more closely at the nature of an electric current. Consider a piece of metal wire - a very much enlarged view of which is shown in Figure 1 . ato ...
Electrical Resistance and Ohm`s Law
... filament in a 100W light bulb? The resistance of the filament is 144 Ω and the current is ...
... filament in a 100W light bulb? The resistance of the filament is 144 Ω and the current is ...
Realization of 476 MHz pulse power cavity amplifier using
... computer simulation of the RF amplifier circuit for optimizing various operating parameters. The amplifier is configured in grounded grid mode and is biased to operate in class AB1 mode. Output tuning & matching network takes the form of cavity resonator and that input tuning & matching network is r ...
... computer simulation of the RF amplifier circuit for optimizing various operating parameters. The amplifier is configured in grounded grid mode and is biased to operate in class AB1 mode. Output tuning & matching network takes the form of cavity resonator and that input tuning & matching network is r ...
Current Electricity Introduction
... *These materials do not hold static charges, since electrons move around • INSULATORS - are materials that do NOT allow electric charges to move freely on or through them. Examples – rubber, glass, plastic *These are the materials may hold static charges, since electrons stay in one spot. ...
... *These materials do not hold static charges, since electrons move around • INSULATORS - are materials that do NOT allow electric charges to move freely on or through them. Examples – rubber, glass, plastic *These are the materials may hold static charges, since electrons stay in one spot. ...
Planck Lab
... terminals being connected to either end of a fixed resistor. The central terminal is connected partway along the resistor with its exact position depending on the orientation of the knob. This provides a variable resistance between the central terminal and the other two terminals. Turning the potent ...
... terminals being connected to either end of a fixed resistor. The central terminal is connected partway along the resistor with its exact position depending on the orientation of the knob. This provides a variable resistance between the central terminal and the other two terminals. Turning the potent ...
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.