I want to convert the 16A current into 5A how can i do it
What are you trying to do ? If the load wants 12V at 5A, then unless its LEDs, it will take what it wants UP to 5A, there is no need to "limit" the current.
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im making small drawing plotter using dvd stepper motors but the motors get too hot I think i have to use some heatsinks
How do you know the motors want 5A ? I suspect they may want 5A. but they will have a very low on resistance.
I kind'of understand Your dilemma. You worry about that 16A to burn something in Your 5A device? Don't worry, just put a 5A fuse there to protect Your device in a case of an "owerload" in Your device,(short, misleaded power-rail, bad ground etc...).
By understanding how Ohms law works.In your case you would not be converting but limiting the current - with a voltage on the said resistor.Would need half a house brick in size and I simply guess it won't work for your purpose.Without any vital infos I also fail to see the point in this...
The laws of electrical nature will do it for you !
I surmise, you have a device rated 12vdc at 5A and you are concerned because the supply could deliver 16Amps and that can scare the non-EE beginner..
Do not worry, Because the device will only use the what current it needs and NOT the 16A that's what's available for other kinds_of_devices..
Yeah.. thanks for the help