Question

A carbon resistor with color band is \[200\,\Omega \]. If red band is replaced by green band then the new resistance is:
A.\[500\,\Omega \]
B.\[300\,\Omega \]
C.\[400\,\Omega \]
D.\[100\,\Omega \]

Answer 1

Hint:Recall the procedure reading of the color codes on the resistors using the color bands. Recall the values of the significant figures in the resistance of the resistor for the red and different value for a three band resistor to determine the new resistance if the red color is replaced by green.

Complete step by step answer:
We have given that the carbon resistor with color bad has resistance \[200\,\Omega \].
The significant figure for the red color on the resistor is 2 and for the green color the significant figure is 5.Hence, the red band is replaced by the green band, the resistor of the carbon resistor will be \[500\,\Omega \].

Therefore, the new resistance is \[500\,\Omega \].Hence, the correct option is A.

Additional information:
There are various types of resistors with the different values of the resistance. These resistors have the different colors from which the value of the resistance of that particular resistor can be determined if one knows how to read that color code. The body of the resistors has three to six color bands to determine the resistance of that resistor. In the color bands on the resistors, some of the first color bands represents the digits in the resistance of the resistor, then next color bands represents the multipliers of the digits in resistance and the last bands represents the tolerance and the temperature coefficient. For a four band resistor, first two colors represents the digits in the resistance, next one color band represents the multiplier and the last color band represents the tolerance.The five and six band resistors are used to denote the resistance with the high precision.The first three color bands in such resistors denote the digits in the resistance, fourth color band represents the multiplier, fifth color band represents the tolerance and six one represent temperature coefficients.

Note:The students should remember the values of the significant figures for various color bands. One should always remember the multiplier value, tolerance values and the temperature coefficient value in order to determine the correct resistance of the given resistor.