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Noob in the field -- problems making a solenoid...

  1. May 29, 2017 #1
    Me and my friends planned to make a solenoid. We used 22 gauge insulated wire and we used an old laptop charger (19v 3.3A) as the power supply. Earlier we used a power supply of 1A and it wasn't enough. When we connected everything and switched on,we saw the solenoid behaving weirdly . We found out that it was changing the direction of the current flow causing it to act like this. I don't know if it is the charger..
    Please can someone help me?
  2. jcsd
  3. May 29, 2017 #2


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    Could it be that the power supply has some circuitry which prevents shorting the output? Maybe you need to put a resistor in series with your solenoid.
  4. May 30, 2017 #3
    Tried adding a 1.5ohms resistor in series but the solenoid ceased to function.. :(
  5. May 30, 2017 #4
    What is the DC resistance of your solenoid? Based on your data the charger needs to have at least 19/3.3 = 6 Ohms load - or 120 feet of 22 Ga ( 22 ga = 0.05 Ohms per foot)....
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