Question

explain working of an electric motor

Answer 1

Flick a switch and get instant power—how our ancestors would have loved electric motors! You can find them in everything from electric trains to remote-controlled cars—and you might be surprised how common they are. How many electric motors are there in the room with you right now? There are probably two in your computer for starters, one spinning your hard drive around and another one powering the cooling fan. If you're sitting in a bedroom, you'll find motors in hair dryers and many toys; in the bathroom, they're in extractor fans, and electric shavers; in the kitchen, motors are in just about every appliance from clothes washing machinesand dishwashers to coffee grinders, microwaves, and electric can openers. Electric motors have proved themselves to be among the greatest inventions of all time. Let's pull some apart and find out how they work!

Answer 2

‡ Electric Motor ‡

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Current in the coil ABCD enters from the source battery through brush 'X' and return back through brush 'Y'.

As a result the direction of the current in arm AB of the coil and CD of the coil is opposite.

Now according to Fleming's left hand rule ,we can find out the force experienced by the coil.The force acting on arm AB pushes it downwards while the force acting on arm CD pushes it upwards. As a result ,the coil and the axle,rotate in anti- clockwise direction. So,when half the rotation is completed, Q makes content with brush X and P with brush Y. As a result ,the rings acts as a commutator , which reversed the direction of of the current.

The reversal of current also reverses the direction of force acting on the two arms AB and CD.

So,the arm AB of the quarrel that was earlier pushed down is now pushed up and the arm CD previously pushed up is now pushed down.

As a result of this, the coil and the axle rotate half a turn more in the same direction.The reversing of the current is repeated at each half rotation, so,the quail along with axle continue to move in same direction.

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