> Is fixed current (or open) so the
> need for voltage is dependent on the
> loop resistance as per Ohms law¦ so
> given that most modern installs are
> oeshort loop (ie often in the same
> room), why the need for something
> that can supply that much
> voltage?????
Look up TIME CONSTANTS in inductive series circuits.
L / R the L is fixed in the selector magnet
so the larger the R is, the faster the current
changes from zero to 60 mA.