First slide

Colour code

Question

A carbon resistor has colour strips as violet, yellow brown and golden. The resistance is

Easy

A

$641 Ω$
B

$741 Ω$
C

$704 Ω$
D

$407 Ω$

Solution

Using standard colour codes
Violet = 7, yellow = 4, brown = 1 and gold = 5 % (tolerance)
So $R = 74 \times 10^{1} \pm 5 % = 740 \pm 5 %$
So its value will be nearest to 741 $Ω$ .

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