1. Power is lost while being delivered along transmission lines. DC is generally low voltage and higher current, while AC has high voltage and low current. This difference results in several things. One is that DC requires heavier lines. So AC transmission lines are cheaper, because they are smaller. Also less power is lost through AC, again a savings of money.
2. I liked the lesson this afternoon about deriving the derivative by graphing and using excel. I plan to work on developing unit on derivative and incorporate what we did to have the students develop and demonstrate who the line equations describe/define the derivative.
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