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Magnetism

Hot goIITian

 Joined: 29 Mar 2012 Post: 158
23 Apr 2012 11:57:47 IST
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emi ac
Engineering Entrance , Medical Entrance , NEET , JEE Main , AIIMS , JEE Main & Advanced , Physics , Magnetism

the armature of a DC motor has 20 ohm resistance. it draws current of 1.5 amp wen run by 220 volt DC supply. d value of back emf inducd in it ll b?? as is 190 V ..hw??

Hot goIITian

Joined: 29 Mar 2012
Posts: 158
23 Apr 2012 18:48:04 IST
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?????

Blazing goIITian

Joined: 8 Sep 2011
Posts: 437
23 Apr 2012 19:34:28 IST
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The difference between the applied voltage and the back EMF is known as net voltage. So here your applied voltage is 220V and the net voltage is 1.5*20=30V.. So back EMF= 220-30= 190

Cool goIITian

Joined: 17 Aug 2009
Posts: 30
6 May 2012 11:14:51 IST
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back emf = applied voltage - voltage drop across armature.use this...

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