- #1
StephenDoty
- 265
- 0
Hey all
I have constructed a basic electromagnet with a nail and a coil of copper wire. I plugged it up to a 9V battery to make sure it worked, which it did, but the electromagnet drained the battery fairly quickly since the coil is shorting the battery out. I have a 12 V 3A dc power supply would putting a resistor in line with the electromagnet help this so my power supply will not be harmed will current is flowing through the electromagnet. If so how do I tell what ohm resistor to use with the electromagnet? Does the number of windings affect which resistor to use? If a resistor will not help, then how do I protect my power supply so it is not harmed or does not melt when connected to the electromagnet? Thanks. I appreciate the help.
Stephen
I have constructed a basic electromagnet with a nail and a coil of copper wire. I plugged it up to a 9V battery to make sure it worked, which it did, but the electromagnet drained the battery fairly quickly since the coil is shorting the battery out. I have a 12 V 3A dc power supply would putting a resistor in line with the electromagnet help this so my power supply will not be harmed will current is flowing through the electromagnet. If so how do I tell what ohm resistor to use with the electromagnet? Does the number of windings affect which resistor to use? If a resistor will not help, then how do I protect my power supply so it is not harmed or does not melt when connected to the electromagnet? Thanks. I appreciate the help.
Stephen