Calculate Resistor for Heating Wire Answered
My Goal is to use a piece of heating wire from an old hair dryer (1.6 Ohms resistance for the length i want to use.)
and heat it red-orange using my old USB power bank. 5V output from an 3.8V lithium ion battery i dont want to mess with the circuitry inside.
The USB Power Bank has short curcuit prevention built in, so when i connect the heating wire the power bank stops supplying electricity.
I found a 7.5 ohms resistor and connected it aswell, the wire became a little warm, the resistor incredibly hot but most importantly the power bank continued to supply power - success.
I would like to know what resistor i should use to get the wire red-orange hot but at the same time keep the power bank safe and not overwhelm it - i think that would mean not drawing too much current? I also cant check how much current is flowing because my multimeter is too cheap and only goes up to 200ma, which the power bank exceeds.
So how would i go about this? What resistor should i use for what wattage should it be rated. And since im a total newb id like to hear your train of thought as to why and how.
Thank you so much.