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Science: Magnetic Effect of Electric Current: Electric Bell and Generator- Flexiprep

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Science: Magnetic Effect of Electric Current: Electric Bell and Generator- Flexiprep 9/22/2021 Science: Magnetic Effect of Electric Current: Electric Bell and Generator- FlexiPrep FlexiPrep Science: Magnetic Effect of Electric Current: Electric Bell and Generator (For CBSE, ICSE, IAS, NET, NRA 2022) Doorsteptutor material for ICSE/Class-10 is prepared by world's top subject experts: get questions, notes, tests, video lectures and more- for all subjects of ICSE/Class-10. Electric Bell This electrical device where electromagnetic is used as components. In electric bell ‘U’ shaped electromagnet is used. This is also called horseshoe electromagnet. Soft iron is placed between the arms of this electromagnet. This is called as ‘core’ . 1 of 4 9/22/2021 Science: Magnetic Effect of Electric Current: Electric Bell and Generator- FlexiPrep ©FlexiPrep. Report ©violations ＠https://tips.fbi.gov/ Force on a Current Carrying Conductor in a Magnetic Field When a conductor carrying a current is placed in a magnetic field, the conductor experiences a magnetic force. The direction of this force is always right angles to the plane containing both the conductor and the magnetic field and is predicted by Fleming՚s Left-Hand Rule. 2 of 4 9/22/2021 Science: Magnetic Effect of Electric Current: Electric Bell and Generator- FlexiPrep ©FlexiPrep. Report ©violations ＠https://tips.fbi.gov/ Referring to the diagram above, F is Force, B is Magnetic field, I is current. Factors Affecting Magnetic Force on a Current-Carrying Conductor in a Magnetic Field Strength of the magnetic field Current flowing through the wire Length of the wire , where F is force acting on a current carrying conductor , B is magnetic flux density (magnetic field strength) , is magnitude of current flowing through the conductor, is length of conductor, is angle that conductor makes with the magnetic field. When the conductor is perpendicular to the magnetic field, the force will be maximum. When it is parallel to the magnetic field, the force will be zero. Electromagnetic Induction Electromagnetic induction is the production of an electric current across a conductor moving through a magnetic field. Generators, transformers some devices which works on this principle etc. working on this principle. Electric Generator Electric Generator is a device that converts mechanical energy to electrical energy. 3 of 4 9/22/2021 Science: Magnetic Effect of Electric Current: Electric Bell and Generator- FlexiPrep Generators are of two types: A. C. Generator (Alternating Current Generator) : This produces current that flows in such a manner that its direction and amplitude changes constantly with time. D. C. Generator (Direct Current Generator) : This generator produces current that flows in the same direction in a continuous manner. Ac and Dc Generator Electric generator works on the principle of electromagnetic induction. It converts mechanical energy into electrical energy. Construction A loop ABCD is rotated in a permanent magnetic field. Its ends are connected with two semi-circular rings as shown in the figure below. These rings are insulated from each other and can slide while remaining in contact with brushes X and Y. A galvanometer is connected between the two ends of the brush. Working On rotating the loop in a magnetic field, the side AB moves upward, and the side CD moves downwards. Thus, magnetic flux linked with the loop changes and a current is induced in it whose direction can be determined by Flemings right hand rule. In the figure, the current is flowing through the path B-A-G-D-C. After half rotation, the ring P comes in contact with brush Y and the ring Q, comes in contact with brush X. Thus, the brush X is always in contact with the side moving upwards and brush Y is always in contact with side moving downwards as a result of which the current flows in one direction. This current is called direct current. This type of generator is called D. C. generator. Similarly, instead of a half ring, if a full ring is used then, A. C. current can be generated, and such a generator is called an A. C. generator. Developed by: Mindsprite Solutions 4 of 4.
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