Explain colour code to determine value of carbon film resistors,

Explanation

`rArr` colour code to determine value of carbon film resistor is shown in table below.

`rArr` To remember this colour code :
B B ROY Goes to Bombay Via Gate Way
`rArr` First and second colour band represent tenth place and unit place of resistance respectively.
`rArr` Third band represent is denoted by n then it represent `10^(n)` power to number obtained by first two band.
`rArr` Fourth band represent tolerance value 5% or 10%. If there are only three band then tolerance value of 20% .
For example , carbon resister have orange, blue, yellow and golden band.
Form table for Orange = 3
Blue = 6
Yellow = 4 = n
`therefore` Resistance value = `36 xx 10^(4) Omega`
`rArr` Fourth band is of golden colour which indicate 5% tolerance.