What is happening
You are called to a scrapyard lifting magnet being rewound after a burnout.
The winder has no note of how many turns the old coil had. It carries 4 A, and the lift needs a field figure of 1 800 ampere-turns.
Electromagnet turnsRunning
Ampere-turns produced
3312A·t
Ampere-turns needed
1800A·t
Ampere-turns produced is over by 1512 A·t
Field coil. Coil turns at 828 turns. Ampere-turns produced 3312 A·t, Ampere-turns needed 1800 A·t. Currently ampere-turns produced is over by 1512 A·t.
What has to balance