Originally Posted by
Tourist in MSN
I assumed that performance curve was based on USB output, thus somewhere around 5 volts.
Makes sense. That would translate into 3W.
Question for you. USB charger brand A delivers 3W@20kmh. USB charger brand B delivers 6W@20kmh. Do you think that wheel drag is the same in both cases or that if B produces more it means that the circuitry creates more drag in the generator?
If the answer were B (more output means more drag), what would be your opinion on the merits of B? Could be a good thing -- once you've recharged your batteries, drag falls to almost zero, the sooner the better.