C H A P T E R Learning Objectives ➣ Relation Between Magnetism and Electricity ➣ Production of Induced E.M.F. and Current ➣ Faraday’s Laws of Electromagnetic Induction ➣ Direction of Induced E.M.F. and Current ➣ Lenz’s Law ➣ Induced E.M.F. ➣ Dynamically-induced E.M.F. ➣ Statically-induced E.M.F. ➣ Self-Inductance ➣ Coefficient of Self-Inductance (L ) ➣ Mutual Inductance ➣ Coefficient of Mutual Inductance ( M ) ➣ Coefficient of Coupling ➣ Inductances in Series ➣ Inductances in Parallel 7
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includes a test coil through which vary or alternating current (AC) is passed. 3. A varying current flowing in a test coil produces a varying electromagnetic field around the coil‚ As shown in this diagram Amperage * # of coils= strength of magnetic field 4. The electromagnetic field produced around the coils is directly proportional to the magnitude of applied current‚ rate of change in current or frequency and the coil parameters. 5. Coil parameters include:
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Introduction to AC Machines Dr. Suad Ibrahim Shahl 3 AC winding design The windings used in rotating electrical machines can be classified as Concentrated Windings • All the winding turns are wound together in series to form one multi-turn coil • All the turns have the same magnetic axis • Examples of concentrated winding are – field windings for salient-pole synchronous machines – D.C. machines – Primary and secondary windings of a transformer Distributed Windings • All the
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used predominately across the world in high power applications. To explain the details of why this is so‚ a bit of background knowledge about AC is necessary. If a machine is constructed to rotate a magnetic field around a set of stationary wire coils
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Magnetism – Lab 19 Go to http://phet.colorado.edu/simulations/sims.php?sim=Magnets_and_Electromagnets and click on Run Now. Part I: 1. Move the compass slowly along a semicircular path above the bar magnet until you’ve put it on the opposite side of the bar magnet. Describe what happens to the compass needle. The white lead of the needle faces the South part of the magnet in a perpendicular way. When the needle is facing the center of the magnet‚ the lead turns to a 90 degree angle
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flux that occurred when the battery was connected and disconnected.[1] Within two months‚ Faraday found several other manifestations of electromagnetic induction. For example‚ he saw transient currents when he quickly slid a bar magnet in and out of a coil of wires‚ and he generated a steady (DC) current by rotating a copper disk near the bar magnet with a sliding electrical lead ("Faraday’s disk").[8] Faraday explained electromagnetic induction using a concept he called lines of force. However‚ scientists
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Batch: 10 Roll: Sh-099 Introduction The basic theory on a ballistic galvanometer starts with torque associated with a current carrying loop. A brief review of ordinary moving coil galvanometer is presented followed by the effects of transient currents. This paves the way for a detailed analysis of ballistic galvanometer. Torque on a Current Loop It is well known that a current loop behaves like a magnetic dipole. The magnitude
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1. Motors use the effect of forces on current-carrying conductors in magnetic fields Discuss the effect on the magnitude of the force on a current-carrying conductor of variations in: The strength of the magnetic field in which it is located • The magnitude of the force is proportional to the magnetic field strength. Thus‚ an increase in magnetic field strength will cause an increase in the force on the wire and a decrease in magnetic field strength will cause a decrease in force on the
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into which the coils are wound. | The armature carries the rotor coils. The armature is the part of a DC motor that rotates and provides energy at the end of the shaft. It is basically an electromagnet | Rotor coil(s) | There may be only one‚ in a very simple motor‚ or several coils‚ usually of several turns of insulated wire‚ wound onto the armature. The ends of the coils are connected to bars on the commutator. | The coils provide torque‚ as the current passing through the coils interacts with
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NVIDIA: long-term growth prospects. Summary NVIDIA will benefit from a growth of driverless cars number through its self-driving platform. A great marketing campaign will allow NVIDIA to increase its number of clients in the automotive industry. Gaming and datacenter businesses of NVIDIA have excellent prospects for a profitability growth. I believe that NVIDIA’s self-driving platform‚ Drive PX2‚ creates a tremendous potential for NVIDIA’s earnings growth. The Drive PX 2 has 12 CPU cores (2
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