I am currently trying to switch on a nichrome wire for about 5s using an Arduino and an external power source. It will be a single use only activation, I have decided to use an N-Channel mosfet for the job since space is limited.
The power source is a Li-ion battery and therefore I need to limit the power going to the nichrome wire to avoid burning it out. Based off some calculations I will need just about 100ma at nominal battery voltage to reach my desired temperature.
Since my arduino will only deliver 3.3v I need to use a logic level mosfet such as the FDN361BN which has a VGS of 1 V to 3 V. I have attached a draft schematic to illustrate my intentions, however how can I limit the amperage?
Can I just lower the voltage of the gate using a voltage divider in such a way that I only allows a certain amount of current based on the datasheets graphs?
Also what is the purpose of the 10k resistor, is it to assure that the mosfet won't get switched on accidentally?