A correction fraction of one reaches the scalar target in one step. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Full correction reaches the target
Correction factor 1 moves from 0 volts directly to 8 volts.
0+1(8−(0))=8
Once the error is zero, the state stays put
The next checked error is 0, so the state remains 8 volts.