For the circuit shown, it is required to get the value of resistor which will limit the current passing through the LED to 5 mA with forward voltage drop of 3.5 V. The supply is 13.5V IF Vs R$ www VD 1800 ohm O 650 ohm O 420 ohm O 2 Kohm O

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Current Division Method

The generalized current divider formula is given by the following relation below,