On Oct 17, 5:44*pm, " wrote:
On Oct 17, 6:36*pm, Karl Townsend
wrote:

Somebody please double check my homework.

Karl

You get an A. *If you happen to have a smaller wattage resistor, it
would work. *It is only in the circuit for half a second. *But
certainly no problem using what was in your scrap pile.

* * * * * * * * * * * * * * * * * * * * * * * * * Dan

Don't forget that once you remove that resistor, the rectifiers are
only conducting for a very short part of the cycle. Once the
capacitors are charged up the incoming power has to go to nearly full
voltage before they start to re-charge the capacitors. So, the current
Spikes can be quite high for a very short period of time, 120 times a
second.
Since all the power is being consumed over a very short period of
time, and at high amperage, a higher percentage of the electricity you
are paying for is used to heat the wires.

You can reduce that, and the inrush current, and reduce you output
ripple with a choke between the rectifiers and the capacitors.