The strongest electrical current flowing through the coil during a pulse. This directly determines how strong the magnetic field becomes. Higher peak current means stronger field output. Measured in amperes (A) at the peak moment of the pulse waveform.
Coil current does not switch on instantly; it builds up along this curve, set by the coil's L/R time constant. It reaches about 63% of full after one time constant, 95% after three, and 99% after five. If the pulse is at least about three time constants long, the current has essentially finished building, so the pulse is complete.
