I bought [this solenoid from ebay][1] and was wondering how to power it.

It says 12 volts as you can also see from the picture, but I tested it with putting a 9V battery straight to its terminals for a while, the solenoid and battery got hot after a while.

I measured it with a multimeter and it read 9.0 ohms. Putting the multimeter through it measured 0.53 amps. Both with 9V battery

If I had battery eliminator that gave 12V output, what other components would I need to make it not go hot? Do I need some resistors?

And is it possible to get its power usage to a minimum with it still opening using various components?

Can I add lots of resistors and the voltage remains 12?


  [1]: http://www.ebay.com/itm/400665025724?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649