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in a zener diode (dc voltage regulator) circuit with `V_("zener")=7.0` V is used for regulation. Thhe load current is to be 4.0 mA and te unregulated input is 11.0 V. what should be te value of series resistor `R_(s)` if zener diode current is five times te load current

A

`120Omega`

B

`167Omega`

C

`180Omega`

D

`200Omega`

Text Solution

Verified by Experts

The correct Answer is:
B
`i_("zener")=5i_(load)=20mA&i_(RS)=i_("zener")+i_(Load)=24mA`
`V_(Rs)+V_("zener")=11`
`V_(RS)+7=11` ,brgt `V_(RS)=4V`
`thereforeR_(S)=(V_(Rs))/(i_(Rs))=(4)/(24xx10^(-3))Omega=167Omega`
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