ELECTROMAGNETIC INDUCTION
... where is the magnetic flux through the circuit. When the B-field is uniform and at right angles to the area A bounded by the circuit, then the flux is simply B*A. (For non-uniform fields, the flux must be calculated by integration.) Often it is useful to distinguish between the case where the B-fi ...
... where is the magnetic flux through the circuit. When the B-field is uniform and at right angles to the area A bounded by the circuit, then the flux is simply B*A. (For non-uniform fields, the flux must be calculated by integration.) Often it is useful to distinguish between the case where the B-fi ...
PS 6.8 - S2TEM Centers SC
... If a complete circuit is made by connecting the two terminals with a wire, the electrons will flow from the negative to the positive terminal. When this pathway exists we say we have a complete circuit or a closed circuit. If there is a break in the pathway we call it an open circuit .An ...
... If a complete circuit is made by connecting the two terminals with a wire, the electrons will flow from the negative to the positive terminal. When this pathway exists we say we have a complete circuit or a closed circuit. If there is a break in the pathway we call it an open circuit .An ...
Circuit Components Lesson 4
... This relationship between voltage, current, and resistance is known as Ohm's Law. This is in honour of the man who discovered this direct relationship (his last name was Ohm). The relationship described in Ohm's Law is used when working with almost any electronic circuit. ...
... This relationship between voltage, current, and resistance is known as Ohm's Law. This is in honour of the man who discovered this direct relationship (his last name was Ohm). The relationship described in Ohm's Law is used when working with almost any electronic circuit. ...
Document
... • All elements to the right of VS2 are replaced by equivalent circuit D. • Currents i0=iD are the same • Voltages V2&V3 lost their meanings but VD is the same. Equivalent circuit ...
... • All elements to the right of VS2 are replaced by equivalent circuit D. • Currents i0=iD are the same • Voltages V2&V3 lost their meanings but VD is the same. Equivalent circuit ...
Amateur Extra Licensing Class
... The magnitude of the impedance of a series R-L-C circuit at resonance is approximately equal to circuit resistance. At resonance, a series resonant circuit L and C present a low impedance so the circuit resistance is set by the resistor. ...
... The magnitude of the impedance of a series R-L-C circuit at resonance is approximately equal to circuit resistance. At resonance, a series resonant circuit L and C present a low impedance so the circuit resistance is set by the resistor. ...
DISSECTIBLE TRANSFORMER - large
... A closed circuit copper loop is provided with a handle attached. The primary coil is placed on one leg of the iron ‘U’ core and this loop is placed over the other leg instead of the secondary coil. Close the iron circuit and clamp the ‘I’ core in place. When 240V.AC. is applied to the primary coil, ...
... A closed circuit copper loop is provided with a handle attached. The primary coil is placed on one leg of the iron ‘U’ core and this loop is placed over the other leg instead of the secondary coil. Close the iron circuit and clamp the ‘I’ core in place. When 240V.AC. is applied to the primary coil, ...
pat2505254_mesner.pdf
... load resistance. to said common point. 7. I n combination with an audio frequency 2. In combination with an audio frequency 35 signal transmission network provided with a pair signal amplifier tube provided with a n output of input terminals and a pair of output termiload, a second amplifier tube pr ...
... load resistance. to said common point. 7. I n combination with an audio frequency 2. In combination with an audio frequency 35 signal transmission network provided with a pair signal amplifier tube provided with a n output of input terminals and a pair of output termiload, a second amplifier tube pr ...
The TESLA coil - Tesla Coil Design, Construction and Operation Guide
... This document is about the theory of operation of Tesla coils as well as the specific behavior of its individual components. It also relates the steps of the construction of my own first coil, Zeus. We will only discuss the conventional Tesla coil, consisting of a spark gap and two tank circuits and ...
... This document is about the theory of operation of Tesla coils as well as the specific behavior of its individual components. It also relates the steps of the construction of my own first coil, Zeus. We will only discuss the conventional Tesla coil, consisting of a spark gap and two tank circuits and ...
Backscattering-Based Measurement of Reactive Antenna Input
... the load, signal to noise ratio is optimized; and 2) the load of the antenna affects the antenna scattering in many unexpected ways, as will be seen later in this paper. A scattering measurement is needed to measure the input impedance of a small reactive antenna; feed line measurements do not give ...
... the load, signal to noise ratio is optimized; and 2) the load of the antenna affects the antenna scattering in many unexpected ways, as will be seen later in this paper. A scattering measurement is needed to measure the input impedance of a small reactive antenna; feed line measurements do not give ...
The Equivalent Circuit of a Transformer
... one voltage level to ac electric power at another voltage level through the action of a magnetic field. • There are two or more stationary electric circuits that are coupled magnetically. • It involves interchange of electric energy between two or more electric systems • Transformers provide much ne ...
... one voltage level to ac electric power at another voltage level through the action of a magnetic field. • There are two or more stationary electric circuits that are coupled magnetically. • It involves interchange of electric energy between two or more electric systems • Transformers provide much ne ...
Crystal radio
A crystal radio receiver, also called a crystal set or cat's whisker receiver, is a very simple radio receiver, popular in the early days of radio. It needs no other power source but that received solely from the power of radio waves received by a wire antenna. It gets its name from its most important component, known as a crystal detector, originally made from a piece of crystalline mineral such as galena. This component is now called a diode.Crystal radios are the simplest type of radio receiver and can be made with a few inexpensive parts, such as a wire for an antenna, a coil of copper wire for adjustment, a capacitor, a crystal detector, and earphones. They are distinct from ordinary radios as they are passive receivers, while other radios use a separate source of electric power such as a battery or the mains power to amplify the weak radio signal so as to make it louder. Thus, crystal sets produce rather weak sound and must be listened to with sensitive earphones, and can only receive stations within a limited range.The rectifying property of crystals was discovered in 1874 by Karl Ferdinand Braun, and crystal detectors were developed and applied to radio receivers in 1904 by Jagadish Chandra Bose, G. W. Pickard and others.Crystal radios were the first widely used type of radio receiver, and the main type used during the wireless telegraphy era. Sold and homemade by the millions, the inexpensive and reliable crystal radio was a major driving force in the introduction of radio to the public, contributing to the development of radio as an entertainment medium around 1920.After about 1920, crystal sets were superseded by the first amplifying receivers, which used vacuum tubes (Audions), and became obsolete for commercial use. They, however, continued to be built by hobbyists, youth groups, and the Boy Scouts as a way of learning about the technology of radio. Today they are still sold as educational devices, and there are groups of enthusiasts devoted to their construction who hold competitions comparing the performance of their home-built designs.Crystal radios receive amplitude modulated (AM) signals, and can be designed to receive almost any radio frequency band, but most receive the AM broadcast band. A few receive shortwave bands, but strong signals are required. The first crystal sets received wireless telegraphy signals broadcast by spark-gap transmitters at frequencies as low as 20 kHz.