Question

The color code of a resistance is given below : The values of resistance and tolerance, respectively, are :

• A. 470 $k\Omega,5\%$
• B. 47 $k\Omega,10\%$
• C. 4.7 $k\Omega,5\%$
• D. 470 $\Omega,5\%$

Answer 1

The Correct Option is D

From colour coding information for electric resistances, we have
$\begin{matrix}{\text{Yellow}}&{\text{Violet}}&{\text{Brown}}&{\text{Gold}}\\ 4&7&1&5\%\end{matrix}$
So, $R=47 \times 10^{1} \pm\,5\%$
$R=470\,\Omega\,\pm\,5\%$

Answer 2

An object's resistance is mostly determined by the material which it is constructed of. Therefore the electrical insulators, like rubber, do have a very high resistance and low conductivity, on the other hand electrical conductors, such as metals, have a very low resistance and great conductivity.

Resistivity or conductivity are used to measure this connection. Resistance and conductance are not just determined by the nature of a material; but they are also influenced by the size and shape of an item, as these qualities are widespread rather than intensive. e.g. The resistance of a wire is higher when it is long and thin, on the other hand it is lower when it is short and thick.

Here below are the color code of resistances:

Black	Brown	Red	Orange	Yellow	Green	Blue	Violet	Grey	White
0	1	2	3	4	5	6	7	8	9

 

 

 

Here below are for tolerance:

Gold	Silver	No colour
5%	10%	20%

 

 

 

So as a result, resistance for the specified colour code is presented as follows:

AB× 10^c± tolerance.

Therefore the first important component value figure is the left side. The second important figure is (some precision resistors have a third significant figure, and which are five bands). The multiplier for decimals (number of trailing zeroes). If present, specify a percent tolerance for a value (no band means 20 percent ). 

So the answer is  R = 47× 10¹±5%

Therefore, R = 470±5%

Hence, the option is ‘D’ .