Since you used the term lights (plural), one of the ways to do that is to wire them in series. So, ten 12 volt lights will equal 120 volts.
You can use a sufficient dropping resistor, but be prepared to trade off a LOT of heat and having to purchase a large wattage resistor.
There are diode/capacitor arrangements, but they're limited to low power applications and may not supply enough power to run your device.
There's the option of a particular IC (sorry, I can't remember the part number) wich will work off of 120 VAC and provide a 12 volt DC output, but then again, the current is limited.
Best bet? Do some research on the internet. The info's out there but you have to spend some time looking for it.
you don't. you just take and use 120 volts from the 220. At least that's what I'd do.
Haynes Manuals, a UK workshop manual but available worldwide.
You will need a charger with 24 volt capability.
www.batteryinternational.com should have a 12 volt battery that will work for you. Hope that helps
1.5v
Change the trailer light bulbs to 24 volts and supply a 24 volt source to power them, in that order.
Use a voltage devider or a transformer.
No adapter is needed, 110 and 115 volt are interchangeable.
All you have to do is change the bulbs to 12 volts and supply the trailer with a 12 volt power source. If you leave the original 24 volt bulb in the trailer they will only glow at 1/2 of their rated wattage.
The only way to do that is with a transformer. They make inline transformers that convert 230 to 115 and they simply plug in inline.
To power ten 12 volt 10 watt lights, you would need a transformer with a total output of at least 120 volts and 100 watts.
yes
If it is AC then you don't need a formula, you just need a transformer.
For higher current applications you would need a power transformer, for lower current applications you would need an adapter transformer.
You can not convert the transformer without cutting the secondary windings. The secondary winding is a split secondary that is wound that way from the manufacturer. To accomplish what you asked would entail unwinding each side of the 12 volt winding half way. At this point solder a pigtail out to a terminal block. This would be your 6 volt tap. Then the coil would have to be rewound to its original state as before the unwind. This same procedure will then be done to the other side of the secondary. Done as a project, maybe, workable within ones capabilities, no.
Transformers are rated in KVA or VA (volt-amps). They transform voltages from one value to another. The current in a transformer is inverse to the voltage. This is why transformers are rated in KVA and smaller ones in VA.
3 phase 220 volt submersible motor convert to 440 volt