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You can calculate the power, in watts, in a dc circuit such as that shown in Fig. 4-7, by the formula P EI or the product of the voltage in volts and the current in amperes. You might not be given the voltage directly, but can calculate it if you know the current and the resistance. Remember the Ohm s Law formula for obtaining voltage: E IR. If you know I and R, but don t know E, you can get the power P by means of the formula P (IR)I I 2R. That is, you take the current in amperes, multiply this figure by itself, and then multiply the result by the resistance in ohms. You can also get the power if you aren t given the current directly. Suppose you re given only the voltage and the resistance. Remember the Ohm s Law formula for obtaining current: I E /R. Therefore, P E(E/R) E 2/R. Take the voltage, multiply it by itself, and divide by the resistance. Stated all together, these power formulas are: P EI I 2R E 2/R

2 covers the basics of interfacing input and output devices such as switches, sensors, LEDs, and motors This chapter also includes an introduction to serial interfacing of the STAMP 2 microprocessor to a personal computer and other devices A QBASIC program for uploading and downloading between the STAMP 2 and a PC is included, and a full terminal program is presented In 3 we explore new and interesting speciality ICs, or serial building blocks While not a specific STAMP 2 project, this chapter presents special ICs that can be used with the BASIC STAMP 2 processor to create new and interesting serial infrared (IR) and radio remote control projects This chapter is a project idea generator designed to stimulate your imagination in finding ways of using some new dedicated microprocessors that, combined with STAMP 2, create powerful new projects..

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Now you are ready to do some problems in power calculations. Refer once again to Fig. 4-7.

Greed run amok, 3 is Burton Malkiel s description of speculators who caused history s investment manias and the inevitable market collapses that followed The boom and bust cycle occurred in Holland in the seventeenth century During the period from 1634 to 1636, prices for tulip bulbs climbed steadily and beyond reason Then, in the month of January, 1637, prices increased twenty-fold In February, the market collapsed and tulip bulb prices dropped by more than the amount they gained in January Many investors lost fortunes and drove Holland s economy into a severe and prolonged depression Speculation ran wild in the late 1920s when stocks soared in the United States and then crashed causing the Great Depression According to Malkiel,4 most blue-chip stocks fell over 90 percent by the time the stock market bottomed out in 1932.

4 features an RJ-45 Ethernet network cable tester This project is a real time saver and prevents headaches Wiring 10Base-T Ethernet networks can be a long and frustrating task, fraught with problems The RJ-45 cable tester uses STAMP 2 to test all eight wires in an Ethernet cable using a walking LED pattern The tester is a two-piece unit One end is placed at the originating end of the cable and the second part of the tester is placed at the end user PC and will test opens and shorts 5 presents an infrared communicator utilizing the STAMP 2 This IrDA transceiver allows the STAMP 2 to communicate with other IrDA-enabled computers, laptops, and personal digital assistants (PDAs), for data collection and transfer 6 illustrates a multichannel wireless alarm system.

Problem 4-10

Suppose that the voltmeter reads 12 V and the ammeter shows 50 mA. What is the power dissipated by the potentiometer Use the formula P EI. First, convert the current to amperes, getting I 0.050 A. (Note that the zero counts as a significant digit.) Then P EI 12 0.050 0.60 W. You might say that this is 600 mW, although that is to three significant figures. It s not easy to specify the number 600 to two significant digits without using a means of writing numbers called scientific notation. That subject is beyond the scope of this discussion, so for now, you might want to say 600 milliwatts, accurate to two significant figures. (You can probably get away with 600 milliwatts and nobody will call you on the number of significant digits.)

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