Assertion: ballast resistor's resistance | /r/CapableOf | make 1/11 of the total voltage
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text: But the interesting bit is what happens initially, when the coil starts out with 10 ohm - the total resistance of the coil and ballast is 11 ohm, making only 1/11 of the total voltage going to the ballast (about 1,1V), while the coil gets 10/11 of the voltage, 10,9V, making the coil get a big kick in the nuts to get current flowing initially, 1,1A instead of 0,6A. This speeds up charging the coil, making it work better at high rpm, without cooking it at low rpm.