Hi,
Im have two computer fans wired in parallel right now, the specs on them say .3 amps at 12 volts. They are connected to a transformer that puts out 1.5 amps at 12 volts and im not sure if this is safe. Should i have a transformer that runs closer to .6 amps or am i okay as is?
The transformer rating of 1.5 A is the maximum. It does not supply 1.5 A unless there is somewhere for it to go. It supplies 12 V. You can take any amount of power from it that you want up to 1.5 A.
A cigar lighter socket in a car supplies 12 V. It is rated at 20A because it has to be made so that it can heat a cigar lighter. When you don't use it no current is supplied. When you plug your cellphone charger into the socket, the charger takes maybe 0.25 A which is fine because it is less than 20 A.