Analysis
This puzzle returns
to the sine wave as a visual tool. The
idea of lead/lag is difficult of many students.
The situation presented in this puzzle states what is expected of the
signals. The puzzle answer in the
annotated puzzle graphic below emphasizes the leading characteristics of the
current signal when it is compared to the voltage signal. If the sine and cosine functions are also
being (or have been) taught the phase shift can be introduced as well. Once that idea is accepted, students can
start to draw phasor diagrams as a quick alternative way to visualize if a
signal is leading or lagging. (The angle
between the two phasors is the phase angle produced by the phase shift.) There are web access routines for learning
about and drawing phasor diagrams. An oscilloscope
simulator may also be available from the web.
If so, the shift from two signals in phase to two signals out of phase
will finish off this lesson idea. Since
most of the intellectual ideas in this puzzle are visually driven, students
from middle school can learn the fundamental idea presented.
Question
The technician has
the wind turbine shipped to the customer. (Yes or No)
Answer: YES
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