I am using a nichrome wire for my project.
Q.1. I want to know which source should I use as my voltage AC or DC? I know that the average power dissipated in a resistor in one cycle(in AC source) is equal to the average power dissipated in DC source. But I want to know which would be efficient for me ... I want to use this to cut fabric.
Q.2 First of all the power dissipated in the circuit will be in the wire(which will act as a resistor). And also the wire will radiate heat energy(Stefans law depending upon emmisivity). So the temperature of the wire will increase for some time and then become constant.
I want to know if there is energy dissipating in any other form?
Edit 1: I figured out a little bit. Now please tell me if there is something to be added in place of something or not! But the problem is that e i.e. emissivity is varying. Then how to use the below formula. We are trying to find temperature but a term in the formula of temperature is itself dependent on temperature :(
$$ V^2/R=e\sigma AT^4 + mS + Something$$