Basic electronics here, but please ask more questions if it isn't clear. Hopefully, you can do basic algebra, because that's all you need for this stuff.
1) Basic equation for current, voltage and resistance.
Current = Voltage / Resistance
2) Resistors in series always add together.
-----R1------R2----
Total resistance over that portion of a circuit is R1 + R2
3) Voltage can be "divided" by using two Resistive loads (resistor or fan, or whatever).
If they are equal resistive loads, the voltage in the middle is half of the voltage sent across the divider.
+12V ----R1-----<+6V>------R2---- Ground
Basically, at the mid point, the voltage is equal to:
Voltage = (Input Voltage) * (R2 / (R1 + R2))
= +12V * (R1 / (R1 + R1)) = +12V * (1/2) = +6V
So, for fans in series, things get complicated. However, all the fans are slowers. Not just the first one.
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