On Nov 22, 12:58 am, John Fields
wrote:
On Wed, 21 Nov 2007 12:34:24 -0800 (PST),
wrote:





Hi John

This is brilliant to see that your calculations tie up with what I
measured on the 24V.

How do I measure the inductance? What do you mean about the spike?
Some magnetic force or a current? Is it the opposite of capacitance?
Then I guess the falling magnetic field will cause a current and then
probably in opposite direction...

BTW I'm using this to knock a little ball the same way as a pool que
hits a pool ball. I presume that a solenoid is the best electrical
component to do this?? My 72V plan should be able to give me the force
required but maybe there's some magical component that can give more
bang per volt.

I'm also considering a solenoid with a higher resistance, which to me
means it must have more wounds/windings to more work. (Surely this
logic is correct - If it's the same brand, looks more or less the
same, then, if the wattage is higher, it must work harder and maybe I
can get away with lower voltage and current for the same performance)

Anyway.. How do I measure inductance?

---
There are several ways.

But first, before we get to the rest of your questions, what kind of
test equipment do you have?

--
JF

I have a digital Volt, Current and resistance meter. (Made by El
Cheapo). I see they call it a domestic meter:
http://www.maplin.co.uk/Module.aspx?...eter&doy=22m11
This is the only measuring tool I have. :-s