DC Motor
DC Motor
An electric motor is a rotating device used for converting electric energy into mechanical energy.
Principle:
An electric motor is based on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it, two equal and opposite forces act on the coil which rotates it continuously.This force which rotates the coil is called as torque.
Construction:
It consists of a rectangular coil, say ABCD connected to a source of current and a switch. The commutators P and Q are fixed to the coil and pressed tightly against brushes X and Y. The function of commutator is to reverse the direction of current flowing through the coil every time, the coil passes the vertical position, i.e. after every half rotation in electric motor. In electric motor, split rings acts as commutator. The brushes are two flexible metal plates or the carbon rods which are so fixed that they continuously touches the revolving rings.
Working:
An electric motor does not convert _________________ | |||
| Right Option : A | |||
| View Explanation | |||
The force on a current-carrying armature of an electric motor can be increased by increasing | |||
| Right Option : D | |||
| View Explanation |
The speed of rotation of the motor can be increases by _________________. | |||
| Right Option : D | |||
| View Explanation | |||
Students / Parents Reviews [10]
Abhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
Om Umang
10thAbout Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
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Ayan Ghosh
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Shivam Rana
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Cheshta
10thOne of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
Aman Kumar Shrivastava
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Barkha Arora
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Archit Segal
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Prisha Gupta
8thAbhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
