Question

The order of coloured rings in a carbon resistor is red, yellow, blue and silver. The resistance of the carbon resistor is :

• A. $24\times {10}^6\Omega \pm 5\%$
• B. $24\times {10}^6\Omega \pm 10\%$
• C. $34\times {10}^4\Omega \pm 10\%$
• D. $26\times {10}^4\Omega \pm 5\%$

Answer 1

The correct option is B $24\times {10}^6\Omega \pm 10\%$

According to colour code of carbon resistors, red stands for $2$, yellow for $4$, blue for $6$ and silver stands for $5$%.
First and second band represents the first two significant figure of resistance.
Third band represents the power raised to $10$ in the value of resistance.
Fourth band represents the tolerance.
Thus resistance of given carbon resistor is $24\times {10}^6\Omega$
Tolerance in the resistance is $10$.
Thus resistance is $24\times {10}^6\Omega \pm 10$%