Difference between revisions of "AY Honors/Radio Electronics/Answer Key"
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== Identify the value of resistors by the color code == | == Identify the value of resistors by the color code == | ||
| + | The value of a resistor is marked on the device itself by using bands of colors. | ||
| + | The color code assigns a number to each of the following colors: | ||
| + | * 0 - black | ||
| + | * 1 - brown | ||
| + | * 2 - red | ||
| + | * 3 - orange | ||
| + | * 4 - yellow | ||
| + | * 5 - green | ||
| + | * 6 - blue | ||
| + | * 7 - violet | ||
| + | * 8 - grey | ||
| + | * 9 - white | ||
| + | |||
| + | Note that after black and brown, the next six colors are arranged as they are found in the rainbow. These colors can also be memorized by the use of a mnemonic such as "Black Bears Run Over Yellow Grass, But Vultures Glide over Water." | ||
| + | |||
| + | Two other colors are used to specify the tolerance of the resistor - that is, how close the actual value is to the value encoded on it: | ||
| + | |||
| + | * 5% - gold | ||
| + | * 10% - silver | ||
| + | |||
| + | If there is no gold or silver band, the resistor has a 20% tolerance. | ||
| + | |||
| + | Remember that just as "gold is better than silver," a 5% (gold) resistor is better than a 10% (silver) resistor. | ||
| + | |||
| + | On a four-band resistor, the third band represents the number of zeros that follow the first two digits, and the fourth band represents the tolerance. So a brown-black-red-gold combination would indicate a 1000 Ohm resistor with a 5% tolerance. | ||
| + | |||
| + | Resistors with tighter tolerance are usually specified with three bands indicating the numeric value and a fourth indicating the number of zeroes following. | ||
== Demonstrate proper soldering techniques == | == Demonstrate proper soldering techniques == | ||
Revision as of 01:28, 23 October 2005
Radio Electronics
Identify at least 20 symbols used in electronics.
Identify the value of resistors by the color code
The value of a resistor is marked on the device itself by using bands of colors. The color code assigns a number to each of the following colors:
- 0 - black
- 1 - brown
- 2 - red
- 3 - orange
- 4 - yellow
- 5 - green
- 6 - blue
- 7 - violet
- 8 - grey
- 9 - white
Note that after black and brown, the next six colors are arranged as they are found in the rainbow. These colors can also be memorized by the use of a mnemonic such as "Black Bears Run Over Yellow Grass, But Vultures Glide over Water."
Two other colors are used to specify the tolerance of the resistor - that is, how close the actual value is to the value encoded on it:
- 5% - gold
- 10% - silver
If there is no gold or silver band, the resistor has a 20% tolerance.
Remember that just as "gold is better than silver," a 5% (gold) resistor is better than a 10% (silver) resistor.
On a four-band resistor, the third band represents the number of zeros that follow the first two digits, and the fourth band represents the tolerance. So a brown-black-red-gold combination would indicate a 1000 Ohm resistor with a 5% tolerance.
Resistors with tighter tolerance are usually specified with three bands indicating the numeric value and a fourth indicating the number of zeroes following.
