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## #9단계의 변경 사항

David Hodson- 에 의해 수정

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### 단계 라인

- [* black] These, my friends, are resistors. Resistors are used in circuitry to control the amount of current flowing through a given circuit. Much like water flowing through a pipe, the narrower the resistor is, the less current that flows through it. [* black] The difference between the two resistors shown is their amounts of resistance. But how can you tell? See those little colored rings, that's how you know. [* black] The first ring to locate when reading a resistor is the red, gold, silver or blank one on one of the swollen ends. These are called tolerance bands. No resistor is exactly the value it indicates, so [http://www.bcdxc.org/resistor_color_codes.htm|tolerance bands] tell you within what percent the reading is. In our case, the tolerance band is gold, indicating a 5% tolerance. [* black] Next, you can read the resistance. All readings are in Ohms. Starting with the band on the opposite end of the tolerance band, you read inwards with each band color indicating a specific number until you only have one band left before the tolerance band. In both resistors, the first two bands are yellow then violet, indicating [http://www.bcdxc.org/resistor_color_codes.htm|2 then 7] for the number 27. The last band before the tolerance is the multiplier. For the first one (left) the third band is red indicating x100. For the second (right) it is brown indicating x10. [* black] From all of this, we read these as 270 and 2700 Ohm resistors +/- 5 percent. [* black] So, what are resistors, and why do we care about them? Resistors are components used in circuitry to control the amount of current flow. The more resistance a resistor has (measured in Ohms), the less current it allows to flow. [* black] The colored bands on a resistor are the key to determining the resistance of that particular resistor. A [http://www.bcdxc.org/resistor_color_codes.htm|resistor color code chart] will come in handy here. [* black] If there are four bands on your resistor, the first band to locate is the red, gold, or silver band on one of the swollen ends; these are called tolerance bands. Since our resistors have gold bands, we know the actual resistance is within ±5% of the nominal value [* black] The next step is to determine the nominal value of your resistor. Starting at the opposite side of the tolerance band and moving from left to right, there are three colored bands. The first two color bands correspond to a number (0-9), and the third band is the multiplier band, which corresponds to a specific power of 10. [* black] Looking at the top resistor shown, we see yellow, violet, and red bands. Consulting a resistor color code chart shows us that those correspond to 4, 7, and 100, respectively, giving us a nominal resistance of 4,700 Ohms. [* icon_note] Can you determine the resistance of the bottom resistor?

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