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    suppose we have to 10 ohm resistences in parallel
    the sum of this two resistence is 5 ohm
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    why two resistence in parallel is used instead of a single 5 ohm resistence
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    The only reason I can think of is if you are dealing with large amounts of power and you need to dissipate it through one or more resistors. Because one resistor cannot handle such large powers.

    Also, a 5ohm resistor might not be available to buy but a 10ohm might be.
 
 
 
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