A Zener regulator has to handle supply voltage variation from 19.5V to – McqOptions

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1.	A Zener regulator has to handle supply voltage variation from 19.5V to 22.5V. Find the magnitude of regulating resistance, if the load resistance is 6K . The Zener diode has the following specifications: breakdown voltage =18V, (I_Z)_Min=2 A, maximum power dissipation=60mW and Zener resistance =20 .
A.	0 < R < 500
B.	77.8 < R < 500
C.	77.8 < R < 100
D.	18 < R < 500
Answer» C. 77.8 < R < 100

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