what type of resistor do i need for 19 and 15 volt power supply?

Question by darpo1: what type of resistor do i need for 19 and 15 volt power supply?
I am connecting regular standard bulbs ( for model railroading) that are 12 volts (25-30 M-amps), however my power supply has 15 volts for DC and 19 for AC. Im going to connect them in parrallel using about 6 bulbs into a terminal block. ………..what size resisitor do i need? and should i connect only one resisitor for all 6 bulbs or each circuit should have its own .

thanks

Best answer:

Answer by Garth W
The easiest way to handle this is to use two silicon diodes rated for at least 1 amp and have a 1.5 volt drop each that will drop your 15 volts to 12 volts. I would full wave rectify the ac output and use 2-3 more diodes to drop the voltage further. I would not use a power resistor to divide the voltage.

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Does one volt really matter on an input rating?

Question by AJ: Does one volt really matter on an input rating?
I have a model railroad crossing signal controller that says on the package 19VAC but I have only 18VAC. I have tested this but it won’t work for either that reason or some other reason. So does one volt really make a difference in this situation? If so, what can I do to fix this and please thoroughly explain how.

Best answer:

Answer by rocksoldier
try an online search for a 19vac

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To operate an electric train set a tansformer must reduce 120 volt house current to 6 volts.What is…?

Question by JasmineM: To operate an electric train set a tansformer must reduce 120 volt house current to 6 volts.What is…?
To operate an electric train set a transformer must reduce 120 volt house current to 6 volts.What is the ratio between turns on the primary (120 volt) side and the secondary (6 volt) side?

Please not only give me the answer but explain it also! Thank you! 🙂
A. 10:1
B. 20:1
C. 1:10
D. 1:20

Best answer:

Answer by billy
I don’t know what kind of train you got but mine all work on 18 volt DC transformer.

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