Signals and Switches

What is the output voltage V_out for the given circuit if the input voltage changes to 0 V?

A +12 V

B +15 V

C +3 V

D 0 V

ANS:A - +12 V

It is similar to voltage divider.

Vout = {[R2/(R1+R2)]*Vin}.
= (4/5)*15.
= 12v.

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