Question

The colour coding on a carbon resistor is shown in the given figure. The resistance value of the given resistor is :

• A. $(7500\pm 375)\Omega$
• B. $(7500\pm 750)\Omega$
• C. $(5700\pm 285)\Omega$
• D. $(5700\pm 375)\Omega$

Answer 1

The correct option is A $(7500\pm 375)\Omega$


Colour 1 - first digit (Violet - 7 )
Colour 2 - second digit (Green - 5)
Colour 3 - Multiplier (Red -${10}^2$)
Colour 4 - Tolerance (Gold - $5\text{\%}$)

So, the resistance of the give resistor is :
$R=75\times {10}^2+5\text{\% of}(75\times {10}^2)$
$\Rightarrow R=(7500\pm 375)\Omega$