My 12 volt battery is 7500 mAh. How many amps does it use when I connect it to my electromagnet and how long will it last? How do I determine this?How quickly does a battery discharge when attached to an electromagnet?that will depend on how much current the electromagnet draws. An ammeter will tell you how much current the electromagnet draws. 7500mAh means that the battery will suplly 7500mA (7.5A for one hour) or 3.75A for 2 hours.
so, 7.5/1hour=current/time battery will lastHow quickly does a battery discharge when attached to an electromagnet?You determine the current by using an ammeter in series with the electromagnet. Or by measuring the DC resistance of the magnet coil (in ohms) and dividing the battery voltage (measured with voltmeter) by that number.How quickly does a battery discharge when attached to an electromagnet?You would need to know how much current (in Watts [VoltAmps]) that the electromagnet uses, then simply do the math. You also need to know if a transformer is in the loop - if it is, you will have to use the figures for output from the transformer in place of the input for the electromagnet.How quickly does a battery discharge when attached to an electromagnet?To answer your question you need to know how many Amps your electromagnet uses. Or the resistance of the electromagnet.
Your battery has a capacity of 7.5 Amp-Hours so if your electromagnet uses 1 Amp then it will last approximately 7.5 Hours. Less for more current and More for less current.
