Electrical Engineering - Voltage, Current and Resistance - Discussion

Answer is wrong.Correct answer is 6800

6800 right

No the answer is 6120. they have asked for the minimum value. which must be 6800- 10% of 6800. (10% because the 4th color is silver which signifies 10% tolerance)

B B R O Y G B V G W

Memorize this colors by the slogan "B B ROY Go to Bombay Via Gate Way of india" and remember the Capital Letters only.

Now Starting from first number them starting with 0.
So Black = 0
Brown= 1
Red = 2
Orange = 3
And so on.
Remember that there are four B in this equation and their order is Black Brown And Blue.


=> Now the first color of the Resistor is The decimal point.
In our CASE it is Blue so it is = 60(Decimal point)

=> Second one is the Unit point.
In our CASE it is Grey so it is = 08(Unit point)
Adding that two is now =68

=> Third on is the power of 10 and multiply it with the combination of decimal and unit point figure.
In our CASE it is Red so it is = 2 Hence it is equal to 10 rest to 2 = 10 ^ 2.
So now the Resistance will be 68 * 10 ^ 2 = 6800 Ohms

=> Now the Last color code is the tolerance hence it is to be introduced in Either in + or in - Formate with the percentage.
There are only 3 possible ways for tolerance.
Gold = +- 5%;
Silver = +- 10%
None = +- 20 %

In Our Case it is Silver so it is = +- 10 %

Finally we got the Resistance value for the given color code is
= 6800 +- 10 %

=> For minimum value substract the 10% of 6800 and or for the maximum value add the 10 % of 6800.

In our CASE it is Minimum so 68000 - 10 % of 68000
= 6800 - 0680
= 6120 ohms

Ans= B

Option b is correct as we have to consider the tolerance.

Of silver that is +/-10%.

Answer is wrong . The Answer is

Blue = 6
Grey = 8
Red = 2
So 6800 Ohms or 6.8k Ohms

Silver is tolerance

Ans is "B", because question is minimum resistance value of given color code so it will be ans is "B"

blue-6
grey-8
red-2
so value is 6800ohms
tolerance +-10%
therefore minimum resistance value is
6800/100*10=680

6800-680=6120ohms
so ans is "B"

B is right

Due to tolerance of 10%, 6800+/-10/100*6800 = 6000 to7600. So according to above mentioned answer 6120 is the lowest value.

Hence answer is 6120.