how many resistor will make 12ohm 13 watts?

i wanna bring 12 v down to 4.5

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Here's a typical example

Use a 240 Ohm and a 620 Ohm resistor
clintonsqs (author)  steveastrouk4 years ago
how many watts should the resistors and capacitors be?
1/8 watt will be fine.
clintonsqs (author) 4 years ago
Can some one please draw me a diagram on how its put togeather. Id appreciate it alot. thank you
LM317 is the perfect answer,
but incase you are unable to find it go with a LM7805,it will bring 12 v to 5 v (just connect a resistor to drop 0.5 volts) & you should be good
You should avoid using resistors to adjust the output of a power supply. Use a diode, and let its 0.5..0.7 v forward drop do it instead.
Thank's for the info :)
Use a regulator, not resistors. An LM317 will be perfect