Cbse Investigatory Project Physics
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In electronic, measurement and control circuits, transformer size may be so small that it weight only a few tens of grams where as in high voltage power circuits, it may weight hundreds of tones. In a transformer, the electrical energy transfer from one circuit to another circuit takes place without the use of moving parts. A transformer which increases the voltages is called a step up transformer. A transformer which decreases the A. voltages is called a step-down transformer. Transformer is, therefore, an essential piece of apparatus both for high and low current circuits. OBJECTIVETo investigate the relation between the ratio of:1. Input and output voltage. 2. Number of turnings in the secondary coil and primary coil of a self-made transformer. THEORYWhen an altering e. f. is supplied to the primary coil p1p2, an alternating current starts falling in it. The altering current in the primary produces a changing magnetic flux, which induces altering voltage in the primary as well as in the secondary.
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... Published on Mar 1, 2017 CBSE Class XII Physics Investigatory Project, - Appropriate content and format for the CBSE practical examinations. CBSE Class XII Physics Investigatory Project 1. 1 KENDRIYA VIDYALAYA, SVP NPA SHIVARAMPALLY, HYDERABAD – 500052 PHYSICS INVESTIGATORY PROJECT ELECTROMAGNETIC INDUCTION SUBMITTED BY: Vaibhav Kandwal XII – A CBSE Roll No. - 2016-17 2. 2 Certificate This is to certify that this "Physics Investigatory Project" on the topic "Electromagnetic Induction" has been successfully completed by Vaibhav Kandwal of class XII – A under the guidance of Mr. M. Shyam Sunder in particular fulfilment of the curriculum of Central Board of Secondary Education [CBSE] leading to the award of annual examination of the year 2016-17. Teacher-In-Charge External Examiner 3. 3 Acknowledgements I have taken efforts in this project. However, it would not have been possible without the kind support and help of many individuals. I would like to thank my principal Dr. NSK Swamy and school for providing me with facilities required to do my project.
In a good transformer, whole of the magnetic flux linked with primary is also linked with the secondary, and then the induced e. induced in each turn of the secondary is equal to that induced in each turn of the primary. Thus if Ep and Es be the instantaneous values of the e. s induced in the primary and the secondary and Np and Ns are the no.
IN A STEP-UP TRANSFORMER: Es > E so K > 1, hence Ns > Np As, k > 1, so Ip > Is or Is < Ip i. e. current in secondary is weaker when secondary voltage is higher. Hence, whatever we gain in voltage, we lose in current in the same ratio. Similarly it can be shown, that in a step down transformer, whatever we lose in voltage, we gain in current in the same ratio. Thus a step up transformer in reality steps down the current & a step down transformer steps up the current. IN A STEP-DOWN TRANSFORMER: Es < E so K < 1, hence Ns < Np If Ip = value of primary current at the same instantAnd Is = value of secondary current at this instant, thenInput power at the instant = Ep Ip and Output power at the same instant = Es Is If there are no losses of power in the transformer, then:Input power = output power Or Ep Ip = Es Is Or Es / Ep = Ip / Is = K Apparatus required Iron Rod: Copper Wire: Voltmeter: Ammeter: CIRCUIT DIAGRAM PROCEDURE Take thick iron rod and cover it with a thick paper and wind a large number of turns of thin Cu wire on thick paper (say 60).
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