If you want to heat up the resistors, you donít have to connect them in parallel as that would only decrease the resistance. Iíd also suggest that get two sets of batteries and connect the send one after a while when the voltage of first set of batteries drops to 4.5V. Since the value of current will lower after a while, the temperature of the heated resistors might fall down because of that. Replace the first set of batteries as soon as the voltage level starts to drop sharply.
Last edited by sergen; 02-27-2013 at 12:10 PM.