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DEMO 1 - Slide the mouse over the gray rectangle to see how reversing the reference direction of V affects its value.
DEMO 2 - Slide the mouse over the gray rectangle to see how turning
Vs over affects the value of V.

DEMO 3 - Slide the mouse over the gray rectangle to see how reversing the reference direction of I affects its value.

DEMO 4 - Slide the mouse over the gray rectangle to see how turning Is over affects the value of I.
