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CHAPTER 5 Starting with Electronics
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Fig. 5-26.
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Two voltage bridges.
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voltage between these two dividers. It is unlikely that the result is zero in the dark. We need to add a trim potentiometer to help calibrate the circuit. Figure 5-24 shows this trim potentiometer in parallel with R3 and R4. You could simply replace R3 and R4 with the potentiometer; however, you get more sensitive calibration results if you build the circuit as shown. The top half of the trim pot is in parallel with R3 and the bottom half is in parallel with R4. Look back at equation (5-6) and see what this means for the total resistance of that voltage divider. One question that should have crossed your mind is, how do you choose the values for R1, R3, and R4 I m glad you asked. Trial and error plays a part. However, if you use your multimeter to test the photoresistor, you will nd that its resistance drops to about 10 k in full light. I used this minimum resistance as the rating for the other resistors. What kind of results would you get if R1 were 1 k 100 k Try these values out in equation (5-8) and see what happens. Try This: Take your resistors and design several di erent series and parallel circuits. Using Ohm s Law, calculate what the resistance across the circuit should be. Now build the circuit and measure it! How close are your results to the calculations Is it within the tolerance of the resistors
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CHAPTER 5 Starting with Electronics LIGHT BULB
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Let s look at one last type of resistor the light bulb. Yes, light bulbs are resistors. They get hot, so hot that they glow white. When you heat up your electric oven, it creates light too, but mostly in the red and infrared (below red, as heat) range. See if you can nd a 60-watt light bulb in your house. Clean the contacts on it and use your multimeter to nd the resistance across the bulb. In my bulb, I recorded a resistance of 19 . Using Ohm s Law (equation (5-2)), and the knowledge that American house voltage is about 110 V, we calculate that this bulb should draw about 5.7 amps. Using the de nition of power (equation (5-4)) we see that this translates into 627 watts. That s not right! In fact, that s ten times what it should be. This is because resistors do not have the same resistance under all conditions. Most metals, for example, increase their resistance as they heat up. A light bulb drawing almost 6 amps is going to heat up a lot, and fast. Doing the math backwards, we calculate that the hot resistance of the bulb should be closer to 200 .
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This was a long chapter, but we had a lot of material to cover. First, we looked at schematics. These are the diagrams that we use to describe electronic circuits, the language of electronics. A schematic is an abstract thing, an idea only. To make it real, we need to build the circuit using actual components. This construction can take place on circuit boards of di erent types, in the air, or in temporary breadboard arrangements. There are new skills involved in circuit building, namely soldering. Though there isn t much call for soldered circuits in this book, when you buy kits or move on to more advanced projects you will need to know how to solder things together. And even here, there will be times when you may want to solder new wires onto a component so it will t into your breadboard circuit. Our rst component was the resistor, a deceptively simple part. With it, however, we were able to build a Wheatstone Bridge that explores many of the features of electricity and resistance. We were given a chance to explore both Ohm s Law and the rules governing resistors in parallel circuits. With your new knowledge you are better prepared to look at schematics and know what they mean, as well as to build the circuits described within them.
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