# Practical resistors

### Explanation of question 1

A 1.2k resistor has a tolerance of 10%. Its resistance value will lie between

1. 1.2k and 1.32k
2. 1.14k and 1.26k
3. 1.08k and 1.32k
4. 1.08k and 1.20k

The answer is :- 3 Tolerance is a measure of the maximum error in the stated value. Thus a 10% tolerance means the component value could be as much as 10% higher or lower than that stated. In this case the maximum error will be 10% of 1200, i.e. 120. Thus the actual component value may lie anywhere between 1200+10% and 1200-10%. Lowest value = 1200-10% = 1200-120 = 1080 = 1.08k. Highest value = 1200+10% = 1200+120 = 1320 = 1.32k.

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