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By Clarence A. Phipps

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The potential or electromotive force is referred to as voltage. Voltage is the force that moves electrons in a circuit. The symbol E is used to represent voltage. A volt (V) is the unit for measuring voltage. Resistance is the opposition to current flow. Resistance is represented by the symbol R. All materials offer some resistance to current flow. The resistance of a material is dependent on the material’s size, shape, and temperature. Conductors are materials with low resistance. Insulators are materials with high resistance.

Two-Significant-Figure Color Code Note: A fifth band may be present, which represents reliability factors and may be ignored. 01 10% No Color 37 20% 38 SECTION 1 DC CIRCUITS FIGURE 4–13 Meaning of the colored bands on a carbon composition resistor. FIGURE 4–15 The fifth band on a resistor indicates the resistor’s reliability. RELIABILITY TOLERANCE TOLERANCE 1ST DIGIT 2ND DIGIT 1ST DIGIT NUMBER OF ZEROS FIGURE 4–14 This resistor has a resistance value of 1500 ohms. GREEN BROWN RED SILVER The meaning of the colored bands on a resistor is as follows.

0056 d. 105 e. 78 4. Define the following prefixes: a. Millib. Micro5. Perform the following conversions: a. 5 A ϭ __________ mA b. 5 A ϭ __________ ␮A c. 150 mA ϭ __________ A d. 750 ␮A ϭ __________ A (1)(X) ϭ (1000)(2) X ϭ 2000 mA EXAMPLE: How many amperes are there in 50 micro-amperes? 00005 A 2–3 50 mA XA 50 ϭ X ϭ (1,000,000)(X) ϭ ϭ X ϭ X ϭ X QUESTIONS 1. Define scientific notation. 2. In scientific notation: a. What does a positive exponent mean? b. What does a negative exponent mean? 3. Convert the following numbers to scientific notation: a.

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