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## Class 10 Physics (India)

### Course: Class 10 Physics (India)>Unit 4

Lesson 5: Electric motor

# Electric motor

Let's learn the working of an electric motor, which converts electricity into a rotation. Created by Mahesh Shenoy.

## Want to join the conversation?

• What about the time when the split rings exposed(open) part comes in contact with the carbon brush wouldn't that create an open circuit situation where the current wouldn't flow ?
• Yes, the circuit will break because the brushes lose contact with the rings when the armature has rotated 90 degrees. But due to INERTIA OF MOTION, the armature continues to rotate and once again, the brushes come in contact with the rings.
• why carbon , for the brushes ?
• Graphite(an allotrope of carbon)is used for brushes for two reasons:
1. It conducts electricity.
2. It is a lubricant so,the split/slip rings can slide easily on it smoothly.
• What is the use of the axle?
(1 vote)
• it is the ones that are going to rotates when the coil rotates.... you can change it with a fan or anything else
• At onwards won't the opposite forces acting on the mentioned arms break the coil and not "not make any difference"?
(1 vote)
• I'm no expert but I'm guessing that the wire would be strong enough to withstand the two forces? like for example, say you have two friends, one pulling your right arm, the other pulling your left arm. The forces cancel each other out because in reality if they are both pulling with the same amount of force then you wouldn't be pushed more to either side. You would stay in the middle so they cancel each other out. I mean yes you would feel both pulling you still but you wouldn't be ripped apart obviously. I guess the same thing can be applied to the wire, it is strong enough to withstand the pulling force but those forces are still pulling, just that they are uselessly pulling on something that I hope should not break so easily. I hope this makes sense, again I may be wrong because I have no idea what the real answer is to your question.
• do you think we might use it in the future
• The whole mankind is currently based on rotary motions. Humans don't know many methods to produce electricity without rotary generators. That is the reason why a very good source of elctricity(sea waves) is getting wasted cause we can't find an efficient way to harvest it. By all that i mean to say that currently Motors and rotory generators(which are basically motors) are the base of modern world. I is going no where in the near future.
(1 vote)
• How do we get magnets with 2 different poles? Are we using a horseshoe magnet here?
(1 vote)
• We can use two separate magnets withh these two in facing opposite poles
• Why are we using the LEFT hand rule? And why are I and B switched? I get that the two nullify each other, but why don't we just do it the normal way and use our right hand?
(1 vote)
• The reason of using left hand rule is that we are discussing conventional current. Current that flows from positive to negative terminal. We use right hand for electrical current (from negative to positive). Maybe that helps. I didn't get the second Question though. Sorry