Hi, I (will)have a 12vdc radiator cooling fan. I am using it for a different purpose. I haven't received the fan yet but the manufacturer say it draws 13 amps. I assume this is at full speed, (But I probly won't run it at full speed) but when I get it I will connect it to an ammeter to see what it really is. I kinda doubt if it draws that much. If it does I will have to get a 15 amp power supply. My question is how to vary the speed of this fan the cheapest way possible? Would a rheostat do it? and what value in ohms and watts will I need? I figure with a rheostat I may have to crank it up to get it started and then slow it down.
Thanks in advance.
Thanks in advance.