i have to power some led stripe from ikea with a drill battery:
On led stripe power is written: 12V 0,25A. and on drill power: 12V 2A.
Now i want to power n led strip (for example: n=4) and i want to understand if there are some side effects or some safety way to do it: do i have to add some resistor? and how to have the best result (=more light) for example mayebe if i use more then 10 stripes the light is reduced or whatever..
and if i want to add more kind of light? (ex: 4V lamp like this black one below)
i had some trials and it seems that there are no problem with 4 stripes in parallel, and i think that there is no need for resistors because both the parts works with 12 volts, but my theory knowledge is very poor (i have only some trial and error experience) and i have no idea with 4V lamps (i think that here i need some resistor) or if i change the power and if i use a different power supply (or even some normal battery like 2 or 3 9V battery in series)
mayebe here there are someone that can explain me how things works and how to design the circuit when i have decided how many light i want.