There are three red coloured hands on a carbon resistor. What is its resistance ?

Options

A. `2.2 K Omega`
B. `2200 K Omega`
C. `(2200 pm 20% ) k Omega`
D. `1.76 k Omega " to " 2.64 k Omega`

Answer

D

Explanation

`1.76 k Omega " to " 2.64 k Omega`
Resistance from three bands of red colour
= 22 `xx 10^(2) = 2200 Omega`
As fourth band is not there, tolerance is 20%
`therefore " Tolerance = 2200 " of " 20 % `
`= 2200 xx (20)/(100 ) = 440 Omega`
`therefore `Magnitude of resistances
`= (2200 pm 440 ) Omega`
= ` 2200 + 440 " or " 2200 - 440 `
= ` 2640 Omega " or " 1760 Omega`
`= 2.64 k Omega " or " 1.76 k Omega`