"It is entirely plausible that Tesla made use of the alternator to continually recharge the Pierce Arrow’s single 12 volt automotive battery and help supply sufficient power to the electric motor.
Alternators do not produce a set voltage. The faster the rotor in the alternator spins, the more the voltage increases."
https://www.apparentlyapparel.com/news/nikola-teslas-wireless-electric-automobile-explained
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