current rating will change according to the wiper position ,then finally power rating also change ,so how we select the cross section area of rheostat wireHow you mention the rating of rheostat?
You are right.
Refer:
http://www.statemaster.com/encyclopedia/How you mention the rating of rheostat?
Rheostat operation changes the voltage sent to the item.
The rating is in the total amperage a rheostat is capable of , when in the full on position.
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