Earlier today, it was really hot so I turned on the fan so that I could better enjoy watching the TV. There were three speeds for the fan and I realized that the fan probably functioned the same way as the variable resistor. Unlike the variable resistors we had studied, however, this variable resistor setup was three separate buttons (shown below) instead of the rotational knob.
Because R=pL/ A and two has a faster speed than one, I can assume that the variable resistor looks something like:
The line in the middle represents the | | |
wire and when I push one of the buttons, | | -|-| (3 Button)
the conductor underneath the surface(-) | | |
of the button (|-|) closes the circuit. | | -|-| (2 Button)
It changes the resistance by changing L | | |
With 1 being the farthest. | | -|-| (1 Button)
| | |
↑
wire
The fan is off when none of the buttons are pressed because the circuit is open.
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