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Ch5_Solutions_WAM2.2

# Ch5_Solutions_WAM2.2 - _Chapter 5 Questions 1 What are five...

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_Chapter 5 Questions 1. What are five examples of devices that use dials and knobs? Light dimmer, model train sets, and volume dial for speakers, joysticks, and servomotors. (p. 137) 2. When the input shaft on a potentiometer is turned, what happens to the resistance at each of its three terminals? Potentiometer as shown in Figure 5-3 p. 138. A B W 10 k Pot Turned clockwise – The wiper is moved close to terminal A. There is less resistance from A to W, more resistance from B to W. Turned counter clockwise – The wiper is moved closer to terminal B. There is more resistance from A to W, and less resistance from B to W. (p. 138) What relationships exist between the different possible pairs of the three terminals? The relationship is: Total resistance from A to B = (Resistance from A to W) plus (resistance from B to W) What effect does this have on an LED circuit connected to the potentiometer’s A and W terminals? Potentiometer turned clockwise – Less resistance from A to W – LED will be brighter. Potentiometer turned counter-clockwise – More resistance from A to W – LED will be dimmer. (p. 138, Activity #1 p. 139-141) 3. Let’s say you have a voltage source that varies connected to P8. What happens to IN8 as the voltage at that I/O pin goes from above 1.4 V to below 1.4 V? What do you think will happen if the voltage increases from below to above 1.4 V? As voltage goes from above 1.4 V to below 1.4 V, IN8 changes from 1 to 0. (p. 145) As voltage goes from below 1.4 V to above 1.4 V, IN8 changes from 0 to 1. (inferred)

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4. If you want to scale the timer measurements on an RC time circuit so that it takes 100 times as long, what part would you replace? How is the new part different from the old part? Replace the capacitor with a capacitor that’s 100 times as big.
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Ch5_Solutions_WAM2.2 - _Chapter 5 Questions 1 What are five...

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