Question
Mon September 21, 2009 By: Aishwarya Unnikrishnan

Resistance

Expert Reply
Wed September 23, 2009

In order to have same current as the other appliances in combination have, the resistance of the iron should be equal to the resultant resistance of the appliances connected in parallel.

therefore

1/ Rtotal =(1/100) + (1/50) + (1/500)  

1/ Rtotal =(5 + 10 + 1) / 500

Rtotal =  (500 / 16) ohm

Current i = V / Rtotal = 220 x 16 / 500 = 7.04 A 

 

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