Have a look in Savoy Place!

No, according to forum rules, quizzes belong in the “Savoy Place Virtual Club” part of the forum, along with other non-wiring regulations topics. You will find all your quizzes in there. 


Regards,


Alan.

Question for 'Zoom' ...... Where on this forum will you find quizzes?

While you are puzzling that one out, prove by simple manipulation of formula starting with Kirchoff's voltage law that resistors are conneced in series.......

Legh ?

That shouldn’t be there either. More interestingly, it is been put there with the agreement of one of the moderators, who appears to have broken their own guidelines. 


Regards,


Alan.

it is been put there with the agreement of one of the moderators, who appears to have broken their own guidelines. 

well, doesn't that really take the biscuit?


 (sorry)


   - Andy.

HI OM de MAPJ1


I presume you have found it now - but in case it was the full wave  3 phase rectifier that ripples at  twice the frequency you may expect.

Clearly a 4 diode bridge gives 100Hz ripple on the output, and needs a smoothing cap that can tide over a good fraction of 10mSec to hold up the Dc between pulses.


A 3 phase bridge with 6 diodes (one phase to each diode) gives 6 pulses per full cycle, as each phase goes to max pos or neg. The ripple is at 300Hz

(car alternators are often wired like this) A smaller capacitor is acceptable for the same p-p ripple.


But there is another version, with even more diodes, that exploits the phase shift between star and delta waveforms, that has higher frequency ripple yet.

Folk who have worked for London underground on DC traction supplies, or who have visited Kempton Park Pumping station should be going 'aha' immediately.

I could come back with a schematic if there is demand,

Sorry for delay. Very busy week