# Practical resistors

### Explanation of question 4

A resistor of quoted value 2.2k is connected to a 12V supply and takes a current of 6mA. The resistance value is

1. within 5% of the quoted value
2. within 10% of the quoted value
3. of exactly 10% error
4. in excess of 10% of the quoted value

The answer is :- 2 Actual value is 12/0.006 = 2000 = 2k. Quoted value is 2.2 k. With 5% error, value would be between 2.09k and 2.31k (actual value does not fall within this range). With 10% error, value would be between 1.98k and 2.42k. This is true.

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