Thanks for the reply .. so is the correct name PCT or PTC, or both?!
I am looking for an application where an area of about 2 to 4 sq/feet of enclosed area made from fabric can be heated using low voltage (12V max)without the danger of overheat, fire, and electrocution (there may be human contact). And I need somewhere between 70 to 80 degree of heat……. from my little research, my limited knowledge, these PCT heaters are perfect as they keep a constant temperature without the need of a thermostat or fan.
I am not sure what power resistors are, but i am guessing essentially a heating coil, right? and I don't think the same can accomplished with a resistance wire . .can it? I tried to search for low voltage heater on the net and found almost nothing!
from my requirements, would you think a resistor or coil heater would be a suitable option. Essentially I am building a small space heater, what are my options?
Thanks again for your reply.