Calculating relays.

[VEN]

I have to build a solenoid for tech, how would one go about doing the calculations, google is either useless or I'm not using correct keywords

[Qbranch]

Can you elaborate a little? What calculations are you trying to do? Power requirements? # of wraps?

-q

[DonRotolo]

Some key factors are the magnetic pull required and the voltage available.

The current in the wire multiplied by the number of turns, and the core size and material, determines the magnetic pull. But, the bigger the current, the bigger the wire must be and so you can't fit as many turns. The number of turns and the wore size determines the bulk resistance of the coil, and so you need a certain voltage to maintain a certain current flow.

Maxwell's equations explain it, but without some college level math under your belt, they won't help much.

So, what kind of pull, what is the power source, any size limitations, etc.. and we;ll get you through it.

Google "electromagnet"


Don

[VEN]

Hey Guys, The solenoid needs to trip at 5 volts. I need to find out how many turns of wire i need. What is the general formula for that is what I need to know.

Thanks