A Zener diode voltage regulator operated in the range 120 -180 V produces a constant supply of 110 V and 250 mA to the load. If the maximum current is to be equally shared between the load and the Zener diode, then the values of series resistance (RS) and load resistances (RL) in ohms are

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RL=440 and Rs=1400

RL=440 and Rs=140

RL=140 and Rs=400

RL=280 and RS =70

answer is B.

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Detailed Solution

output voltage is 110 V and output current is 250 mA so load resistance will be RL=110250×10-3=110×103250=440 Ωtotal current = 500 mAmax. voltage across the series resistance is 180-110=70 Vseries resistance is Rs=70500×10-3=70×103500=140 Ω

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