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could some 1 do a justice to this question

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yanda

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please what is pull-up and pull-down resistors and what exactly is there function in a circuit
 
Generally, they are used to pull an input to a known state when there is no driving signal.

But they do have other uses.
 
pull up means resistor from output point to +ve, pulldown means resistor from output point to -ve .The condition when no output is awailable at the output point , your pulledup+ or pulldown - will prevail
 

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