I forgot to read the valuable comments on this thread as i didn't received any notification in mail and got busy with the studies yesterday. Sorry for that.
The situation i have is the power source ( suppose 12V, constant voltage) will be connected to some kind of circuitry which will then connect to heater. But the thing is the heater coil will be variable, meaning at the output i have some coils which i want to heat but if the current is not limited the heater coil will get heated too fast and might melt down. So i want to have a control over current to avoid destruction of heater coil. Coils of different resistance is there.
Also i want to know which is better, to vary the current or the voltage to limit the power to the heater?
The situation i have is the power source ( suppose 12V, constant voltage) will be connected to some kind of circuitry which will then connect to heater. But the thing is the heater coil will be variable, meaning at the output i have some coils which i want to heat but if the current is not limited the heater coil will get heated too fast and might melt down. So i want to have a control over current to avoid destruction of heater coil. Coils of different resistance is there.
Also i want to know which is better, to vary the current or the voltage to limit the power to the heater?