Electronic Devices And Circuits I J Nagrath Phi 2007 Pdf Rapidshare [UPD]
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A common type of transformer used in radio, audio, and instrumentation is the audio transformer. Audio transformers are used to couple stages of amplifiers and to match devices such as microphones and record players to the input of amplifiers. Audio transformers allowed telephone circuits to carry on a two-way conversation over a single pair of wires. A balun transformer converts a signal that is referenced to ground to a signal that has balanced voltages to ground, such as between external cables and internal circuits. Isolation transformers prevent leakage of current into the secondary circuit and are used in medical equipment and at construction sites. Resonant transformers are used for coupling between stages of radio receivers, or in high-voltage Tesla coils.
Electromagnetic induction is the interaction of the magnetic field of one electrically conducting loop (the primary) with another (the secondary) that is placed inside the first, and that links to some other circuit, to produce a changing magnetic flux in the primary. This changing flux induces an electromotive force (emf) in the secondary. The direction of the emf is in the same direction as the change in flux in the primary, and the strength of the emf depends on the turns ratio between the number of turns in the primary and the number of turns in the secondary. The induced emf can be used to power electrical devices, such as motors and light bulbs, or to produce a useful electric signal. A transformer can use one set of coils as the primary and another set of coils as the secondary. A simple form of transformer is a coil of wire wrapped around a ferrous core, generating a magnetic field that induces an emf in a second coil surrounding the primary coil.
In the 1890s, an electrical station received a complaint about electrical transformers from a fire department. The owner of the station replied that they were not electrical transformers, but simply transformers. This example illustrates the general usage and misnomer for the electrical device.
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