Hello everyone, welcome to BST online channel! Today, we're going to dive into the fascinating world of resistors and learn how to decode their color bands. Resistors are essential components in electronic circuits, and the color bands on them convey important information about their resistance value and tolerance. We'll be discussing both 4-band and 5-band resistors.
-Identify the Number of Bands:
If there are four bands, the first two bands represent significant digits, the third band represents the multiplier, and the fourth band represents the tolerance.
If there are five bands, the first three bands represent significant digits, the fourth band represents the multiplier, and the fifth band represents the tolerance.
-Identify the Colors:
The colors are assigned specific values:
black (0), brown (1), red (2), orange (3), yellow (4), green (5), blue (6), violet/purple (7), gray (8), and white (9).
-Determine the Values:
Read the colors from left to right and assign the corresponding digits.
For the tolerance band, the colors are usually gold (±5%) or silver (±10%). Sometimes, resistors with tighter tolerances may have different colors.
-Calculate the Resistance:
For a four-band resistor, use the first two digits as significant figures, the third as the multiplier, and the fourth as the tolerance.
For a five-band resistor, use the first three digits as significant figures, the fourth as the multiplier, and the fifth as the tolerance.
-Example:
Let's say you have a resistor with the color bands: red, violet, green, and gold. Using the color code:
Red (first digit) = 2
Violet (second digit) = 7
Green (multiplier) = 10^5 (100,000)
Gold (tolerance) = ±5%
So, the resistance is 27 * 100,000 = 2,700,000 ohms (or 2.7 megaohms) with a tolerance of ±5%.
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