Home Security Power
asking for project of an electromagnet?
greetings,
i was making an electromagnet with very simple components which are soft iron core, suitable insulated wires, and a radio shack lead acid battery for high amp(A)…..(12volt 7amp)(http://www.radioshack.com/pwr/product-reviews/Power-Batteries/Home-office-power/Home-security-power/RadioShack/p/2049668-12-Volt-7Ah-Lead-Acid-Alarm-Battery.html)
so are there any electric hazards in just wrapping up the iron core with the wires and placing the wires in the 2 terminals in that kind of battery without any other electric components?
and thank you
No, there’s no electrical hazard in just winding the wires around a soft iron core and connecting to the terminals. If you have alligator tooth connectors or jumper cable style connectors, or perhaps slip-under-screw connectors, those would be vastly preferable to simple wrapping and taping, since the impedance on those kind of connectors is much lower than a simple wrapping.
Note that when you hook up the battery to the winding/core, you may cause an arc and the voltage will spike momentarily because the electromagnet components are in reality an inductor. If you understand basic calculus, then the voltage across the inductor is V = L (dI/dt), where L is the inductance (a little more complicated to explain, but soft iron core + lots of winding + thin core + long = high inductance), I is current, V is voltage, and dI/dt is the rate of change of the current — when you hook up the inductor to the battery, current will go up rapidly, so voltage across it will spike and you may get an arc across the connection (only lasts about a millisecond, but the voltage is high). So just be careful when you hook it up. Or better yet, use a switching device of some kind.
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January 25th, 2009 in
Uncategorized | tags: home security power, home security power outage, home security power supply, home security power transformer, home security power-832, home security powerlink, home security powermax, home security powerpoint, home security powerpoint presentation, home security powerpoint template