spinner wheel to pick names
A spinner wheel splits a circle into slices, one per entry, and spins until it lands on one of them, and the winning slice is decided by a random number generated the instant it spins, not by where each name started on the wheel.
With no weight set, the sum of weights equals the number of entries, so each one chance is simply 1 divided by the total.
Each item chance is its own weight divided by the total sum (6): 1/6, 2/6 and 3/6, which also set the slice size for each one on the wheel.
Since "Ana" left the wheel after winning, the chance for the remaining 3 names rises from 25% to 33.3% each, because the weight sum is now 3 instead of 4.
The weight sets the slice proportion and, therefore, the odds. An option with weight 2 takes twice the space of one with weight 1 and is twice as likely to win. This lets you create fair draws (all equal weights) or intentionally biased ones (someone with higher odds).
The chance is that item weight divided by the sum of weights of every item on the wheel; doubling one item weight doubles its relative chance, but it does not change the proportions among the other items relative to each other.
Yes, if each prize should go to a different person: with removal on, whoever already won leaves the wheel and cannot be drawn again, and the odds for everyone else rise with each round.
Only if the remove-winner option is off; with it off, the drawn item stays on the wheel with the same weight and can be drawn again in a following round.
No. The stopping angle is decided by a random number drawn the moment it spins, not by the order the names were typed in; position only changes the visual slice size when weights differ.