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Electric charges move very slowly through your wires, slow like the minute hand on a clock is slow. And yet, when you turn on a light switch, the power reaches the bulb at, roughly, the speed of light.
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CHAPTER 4 Electricity
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The electrons in your wire don t move fast, but they move together. Here is another electrical analogy, the clothesline. Take two pulleys and anchor them on two di erent sides of your yard. Wrap a rope into a circle, through these pulleys. When you pull the rope on one side of the yard, the pulley on the other side feels the force instantly. The rope itself is moving slowly, but the power is transmitted by the rope quickly.
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This chapter covered a lot of territory, nothing less than the structure of everything in the universe! We looked the closest at the electron and the electric and magnetic elds associated with it. Because of the special relationship between magnetism and electric charges, we can use magnets to pump electricity. Using these same elds in the other direction, we can use electricity to push against the magnets.
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1. What is the di erence between a conductor and an insulator 2. What is electricity 3. How do the magnetic eld and the electric eld interact How does this relate to the way radios work Electric generators Electric motors 4. What is a circuit I m not going to ask you to de ne amps (coulombs of charge moving past a point per second) or voltage (charge di erence) because, frankly, you can look up the formulas. It is more important to have an understanding of what electricity does before you get buried in the math describing it. Of course, in later quizzes I may not be so easy on you, so keep an eye on those equations.
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CHAPTER
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Starting with Electronics
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Introduction
Enough with the theory! The terms and de nitions and forces are important, since they give us the language and concepts we need to do our work, but learning the nature of the joule isn t where the fun is. This chapter is where we start to put theory into practice. First, of course, there is a bit more theory to learn. To describe electronic circuits, we draw them using circuit diagrams, or schematics, so you need to learn how to read those. Then there are a few practical details of where to get electronic components and how to wire them together.
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CHAPTER 5 Starting with Electronics
Then we get to play with that most basic of all components, the resistor. Even though a resistor doesn t do anything, except perhaps turn electricity into heat, it has several subtle uses. It also provides illustrations for some of the forces we talked about in 4.
Electronic Circuits
SCHEMATIC
A schematic is a diagram that represents, in abstract lines and squiggles, an electronic circuit. It is almost like a road map, but even more abstract since a road map shows where things are positioned in space relative to each other and a schematic does not. The schematic only shows how the components, or parts in an electronic circuit, are connected to each other. An example of a schematic for a simple circuit is shown in Fig. 5-1. There are several features in this gure that are common to all schematics. The little pads on the left labeled 5 and Gnd are plugs to the outside world. External to this circuit we expect there to be a 5-volt power supply. Electricity is always measured with respect to a ground state. It s handy to label which wires we expect to be at zero volts, or ground. The inverted pyramid in the bottom-left corner is one of several symbols that mean ground. One version of ground has only one horizontal line instead of a pyramid of them. Note that ground is our source of electrons. The lines in the schematic are the wires that connect everything together. A round dot at a junction of lines means that these wires are connected. Sometimes you have to draw wires in the schematic so they cross each other
Fig. 5-1.
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