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A light-emitting diode (LED) has a voltage drop of 2V across it and passes a current of `10 muA`, when it operates with a 6V battery with a limiting resistor R. what is the value of R ?

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`I=V/R ` or `R=V/I`
`R=((6-2)V)/(10xx10^(-6)A)=400 kOmega`

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