Question

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

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

Answer 1

In an electrical circuit, resistance is a measure of the resistance to current flow. The Greek letter omega ($\Omega$) is used to represent resistance in ohms. Georg Simon Ohm (1784-1854), a German scientist who researched the link between voltage, current, and resistance, is the name given to Ohms. Ohm's Law is said to have been formulated by him. To some extent, all materials oppose current flow.

Complete step by step answer:
An object's resistance is mostly determined by the material it is constructed of. Electrical insulators, such as rubber, have a very high resistance and low conductivity, whereas 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; they are also influenced by the size and shape of an item, as these qualities are widespread rather than intensive. The resistance of a wire, for example, is higher when it is long and thin, and lower when it is short and thick.

According to color code of resistances:

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

For tolerance:

Gold	Silver	No color
5%	10%	20%

As a result, resistance for the specified colour code is presented as ${\text{AB}} \times {10^{\text{C}}} \pm {\text{ tolerance }}$. The first important component value figure (left side). The second important figure is (some precision resistors have a third significant figure, and thus 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 here it is
${\text{ So, R}} = 47 \times {10^1} \pm 5\%$
$\therefore {\mathbf{R}} = 470 \pm 5\%$

Hence option C is correct.

Note: Electric colour codes are used to show the values or ratings of electronic components, such as resistors, capacitors, inductors, diodes, and other components. Wires in certain telecommunications cables are identified using a different code, the 25-pair colour code. For wire leads on equipment like transformers or in building wiring, different codes are used.