Question

For a carbon-composition resistor color-coded with yellow, violet, red and silver stripes from left to right, the value of resistance and tolerance are

Select one:
740 Ω ± 50%
470 Ω ± 10%
4.7 kΩ ± 10%
74 Ω ± 5%

Answer 1

#(option C)

• We know that in resistance color coding system, 1st band represent the first significant digit, 2nd band represent the second significant digit, 3rd band represent the multiplier and 4th band represent the tolerance.
• Now, we have 4 band strip with color code yellow, violet, red and silver respectively.Hence yellow is 1st band followed by violet , red and silver.

Now, from color code chart

Yellow strip has value = 4

Violet strip has value = 7

Red strip has value = 100

Silver strip has value = +/- 10%

Hence, the resistance value is,

R = (47*100)+/-10%

R = 4.7 kOhm+/-10%.

Hence, option (C) is the correct option.

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