Full-Wave Bridge Rectifier Filter + Regulator DC Power supply

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Petrucciowns
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Ok, there are a few calculations on this problem that I am having difficulty with. This is a past homework assignment which is why the answers are filled in. They are all correct.

Anyways I approached the problem in this manner:

V secondary peak = V2/ .707

The voltage drop across RL is ZZT

IRL= ZZT/RL

VC1P= V2P - Both forward biased diode drops.

VC1 P-P (Ripple) = IDC / (2f * C)

VRS= Vc1 dc - Vzt

IRS= VRS /RS


The three that I am having trouble with are: Vc1-dc , IZ, and VRL p-p (Ripple)

Can anyone help me out?

Thanks.
 
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Now all I need to know its how to find the value of. Vc-dc