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The following circuit illustrates an array of 20 LEDs ( 5 rows with 4 LEDs on each rows). The LEDs are identical and each row is powered by a DC voltage source of 14 volts. Each row has a 47 ? current limiting resistor. It is known that each resistor has power dissipation of 18.8 mW in this circuit. Determine:

(1) The current going through each resistor. [ans. 20 mA)

(2) The voltage across each LED

(3) The power dissipation over each LED

(4) The total current from the source

(5) The total power from the source (1.4W)

Note that Ohm's law is not valid for the LEDs.

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Operation Management, Management Studies

Category:- Operation Management
Reference No.:- M9352979

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