Voltage Multiplier Circuits (Half Wave Voltage Doubler) 

You can take any direction of loop ....here its for Voltage.

yes but read the purpose of voltage multiplier again at the very beginning of the video, "maintain low transformer peak voltage". That is if we dont want to use transformer in that manner then we can use the voltage multiplier circuits instead.

@@maxsash But isnt it correct that when Vm tends to zero in 1st cycle, c1 should be discharged

During negative half cycle D1 won't conduct. So path is open and C1 can't be discharged.

thx man but what about the polarity of c1 acc to u it's just reversed

Same doubt

I think it will be charged based upon on polarity of input voltage

good lucture

Yeah bro,Vo is 0 ,Because D2 is open,No current flows,so no output

It's wrong

Nope bro.... because c1 is already chaged by first phase of voltage... that's why polarity different

Can u please explain this to me?

Vighnesh Tamse - while writing KVL assume any polarity and write the equation. If Vc2 comes out to be negative then assumed polarity is wrong then to correct the polarity just reverse the polarity you have assumed. In this video sir got the answer in positive I.e.Vm therefore his assumed polarity is correct.

@@shubhamnayak9369 is that applicable only for capacitors ? because when you deal with diodes there is a specific polarity and if you ever obtain a negative output it is not considered wrong . Just like Halfwave rectifiers with output of -Vm

@@snowwhite3478 diode is a nonlinear Device .. it is ON only in specific direction while capacitor is a bilateral device which conducts in both directions..so you don't need to check polarity of diode as you already know it's polarity...but if you learn further you will get to know that incase of diode you find whether diode is ON or OFF by observing current direction..i.e you assume diode to ON so direction of current is from anode to cathode and if current value is -ve then actual current is flowing opposite to your assumed direction but we know that current through diode can't flow from cathode to anode so your diode is in OFF condition.

@@snowwhite3478 in half wave rectifier you will never get other half of input voltage... because Diode doesn't allow current from cathode to anode

@@shubhamnayak9369 bro if we r taking c1 polarity from + to - and c2 polarity from - to + then How can it be equal to the setup where we take both c1 and c2 polarity from + to -.

He draws wrong direction during negative half ,the correct direction is opposite

No bro,During -ve half cycle ,Polarity of capacitor will be reverse to that of in positive cycle,