Resistance

Asked by ash.au94 | 21st Sep, 2009, 10:16: PM

Expert Answer:

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 

 

Answered by  | 23rd Sep, 2009, 09:30: AM

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