A.C current meters Introduction An ammeter is a measuring instrument used to measure the electric current in a circuit. Electric currents are measured in amperes (A)‚ hence the name. Neither type of basic dc PMMC meter movement will correctly indicate an alternating current. There are‚ however‚ four basic types of meter movement that will indicate ac values:- Thermocouple Hot wire Electrodynamometer Iron-vane Electrodynamic ammeters An electrodynamic meter uses an electromagnet instead
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ACKNOWLEDGEMENT It gives us great pleasure when a certain task is accomplished with great zeal and enthusiasm. We would like to extend our heartfelt thanks and deep sense of gratitude to all those who helped us in completing this project. First and foremost‚ we feel greatly indebted to Mr. D. M. SINGH and Mr. UBAID AHMAD KHAN‚ from the core of our heart for their constant support and valuable guidance time to time‚ because they encouraged and
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Theory The physical basis of the transformer is mutual induction between two circuits linked by a common magnetic field. Transformer is required to pass electrical energy from one circuit to another‚ via the medium of the pulsating magnetic field‚ as efficiently and economically as possible. This could be achieved using either iron or steel which serves as a good permeable path for the mutual magnetic flux. An elementary linked circuit is shown in Fig.1. The principle of operation of this circuit can be
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TECHNOLOGICAL INSTITUTE OF THE PHILIPPINES 938 Aurora Boulevard‚ Cubao‚ Quezon City ELECTRICAL ENGINEERING DEPARTMENT In Partial Fulfilment of the Requirements for the Degree of Bachelor of Science in Electrical Engineering and Completion of the Subject AC Apparatus and Devices with the design project entitled: A Proposed Design of 75KVA‚ 13.8KV/230 V‚ 60Hz 1ᶲ Distribution Transformer (Core Type with Cruciform Section) Submitted by: Alcantara‚ Jhonner P. Carasket‚ Runel
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the University of Lyon just one year later. In 1809‚ Andre Ampere was appointed professor of mathematics at the Polytechnic school in Paris. He was admitted as a member of the Institute in 1814 and in 1820‚ after H.C. Orsted’s discovery that a magnetic needle is acted on by a voltaic current‚ Andre sent a paper of his own to the Academy that was much more detailed. He didn’t wait‚ on September 18‚ 1820‚ the very same day that he sent his paper‚ he presented a demonstration to the Academy that parallel
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FUSE THEORY The energy conversion process is carried out with the help of magnetic fields. These conversion processes also result in losses to the machine. Types of Losses The losses in a three phase induction machine are broadly classified into the following types 1) Magnetic losses 2) Electrical Losses 3) Mechanical Losses Magnetic losses The presence of rotating magnetic field in the stator core results in the magnetic losses. Stator core is made up of silicon steel or iron stampings‚ these losses
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difference the potential energy is then converted to kinetic energy. When an electron is placed into a magnetic field it experiences a force that is perpendicular to the velocity of the electron and the magnetic field. This causes the electron to move in the pattern of a circle‚ and centripetal force is generated. This tells one that by unit analysis the e/m ratio can be determined by the voltage‚ magnetic field and the radius of the circle that the electron is traveling in. Experimental Procedure This
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Single-phase induction kilowatt hour meter - Construction Single-phase induction kilowatt hour meter - Construction An adjustable copper shading rings are provided on the central limb of the shunt magnet to make the phase angle displacement between magnetic field set up by shunt magnet and supply voltage is approximately 90 degree. The copper shading bands are also called the power factor compensator or compensating loop. The series electromagnet is energized by a coil‚ known as “current” coil which
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Transformer) is an electromagnetic device that produces an electrical voltage proportional to the displacement of a movable Magnetic Core [pic] [pic]A COIL WINDING ASSEMBLY consisting of a Primary Coil and two Secondary Coils symmetrically spaced on a tubular center. [pic]A CYLINDRICAL CASE which encloses and protects the Coil Winding Assembly. [pic]A rod shaped MAGNETIC CORE which is free to move axially within the Coil Winding Assembly. [pic]A separate shield is used for ELECTROMAGNETIC
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reading of the galvanometer remains the same with switch S open or closed‚ then what is the value of current through galvanometer ? 1 di es IP IR P w .s to V B Q HS w A da y D C G D w R 6. 7. 8. 9. How will the magnetic field intensity at the centre of a circular coil carrying current change‚ if the current through the coil is doubled and the radius of the coil is halved ? 1 Define eddy current. What is the ratio of speed of gamma rays and radiowaves in vacuum
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