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Table 5-2 Prototype circuit board manufacturers http://www.apcircuits.com/ http://www.cadsoft.de/ http://www.expresspcb.com/
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RESISTOR
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Everything acts as a resistor to some extent. However, there is also a speci c electronic component called the resistor that provides a calibrated resistance. Resistance is measured in ohms, and the ohm is represented by the Greek letter  (omega). Resistance is the measure of a material s opposition to the movement of electrical charge. As you are trying to pump electrons through a circuit, the resistance of the circuit is ghting back, keeping the electrons from moving as easily as they might. Everything has some resistance, even the wire and copper traces in a circuit board that you use to connect components together. While many resistors are made from a carbon lm, like a conductive paint, highly accurate resistors are made from ne wire. Usually, though, the resistance in your wire is too small to make any di erence for low-power circuits. One of the byproducts of resistance is heat. The harder you push electrons through a resistor, the more heat is created. The energy you are using to push electrons through the resistor doesn t make it all the way through, since the resistor is opposing that force. The result, then, is heat. Using the clothesline analogy again, as you are pulling on the clothesline, someone in the middle is pinching the rope with their ngers. This slows down the rope, or at least makes it harder to pull, at the expense of making their ngers hot. Looking at Fig. 5-15, you can see the schematic symbol for the resistor is a jagged line. The resistor itself is a cylindrical blob on a wire, with three or four stripes. The stripes will normally be closer to one end of the resistor than the other. To read the stripes, orient the resistor so the stripes are on the left. Note that resistors don t care which direction you plug them into circuit. We put the stripes on the left for easy reading.
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Fig. 5-15.
Resistor.
The rst and second stripes are color codes for di erent digits. Black is 0, Brown is 1, and so forth. All of the colors and their meanings are listed in Table 5-3. The third stripe is a multiplier, and it determines how many zeros you add after the rst two digits. A resistor marked Black, Brown, Black has a value of 1 . Black, Brown, Brown adds a zero, so the value is 10 , and so forth. The reverse is also true. When you see a resistor valued at 4.7K on a schematic, you want a resistor whose rst two stripes are Yellow and Violet. Since K means 1,000, the full value is 4,700. Since we need to add two zeros, the third stripe is Red. The fourth and last stripe is an optional tolerance indicator. No device is perfect, so this stripe indicates how imperfect the resistor is. If there is no fourth band, the resistor s actual value is plus or minus 20%, or somewhere between (R 0.80) and (R 1.20). Better resistors have tighter tolerances, as indicated in Table 5-3. In addition to the resistance value, resistors also have a power rating. The power rating determines how much power, in the form of heat, the resistor can handle. Most circuits use 1/8 or 1/4 watt resistors. When a larger resistor is needed, the power rating is usually speci ed in the parts list.
OHM S LAW
The unit of resistance, the ohm, is named after the German physicist Georg Ohm. His work had a strong in uence on our understanding of electricity and resistance. The relationship of resistance to current and voltage is known as Ohm s Law in his honor. Ohm s Law states: V I R 5-1 Equation (5-1) states that when a current encounters friction in the form of resistance, a voltage appears across the resistor. Remember that voltage is like a pressure di erence between two points in the circuit. When the
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