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Magnetism

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23 Apr 2012 11:57:47 IST

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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??

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PALAK JAIN

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23 Apr 2012 18:48:04 IST

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?????

Gargee Mehta

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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

Rajdeep chakraborty

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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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