Resistors.
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Disclaimer: The information presented on this page is intended for people of 21 years of age or older who have a good working knowledge of electrical and electronic safety. The author is not responsible for any loss of any kind brought about by using the information given.
Resistors are manufactured to a certain tolerance. The actual value of a resistor can, therefore, be within a certain range. For this reason there are 'preferred values' of resistors. The following tables show three series, the E12, E24 and E96 series. These are so named because they define respectively 12, 24 and 96 values in each decade of resistance.
E12 Preferred Values: (for 10% tolerance resistors)
| 1.0 | 1.2 | 1.5 |
| 1.8 | 2.2 | 2.7 |
| 3.3 | 3.9 | 4.7 |
| 5.6 | 6.8 | 8.2 |
E24 Preferred Values:
| 1.0 | 1.1 | 1.2 | 1.3 | 1.5 | 1.6 |
| 1.8 | 2.0 | 2.2 | 2.4 | 2.7 | 3.0 |
| 3.3 | 3.6 | 3.9 | 4.3 | 4.7 | 5.1 |
| 5.6 | 6.2 | 6.8 | 7.6 | 8.2 | 9.1 |
E96 Preferred Values:
| 1.00 | 1.02 | 1.05 | 1.07 | 1.10 | 1.13 | 1.15 | 1.18 |
| 1.21 | 1.24 | 1.27 | 1.30 | 1.33 | 1.37 | 1.40 | 1.43 |
| 1.47 | 1.50 | 1.54 | 1.58 | 1.62 | 1.65 | 1.69 | 1.74 |
| 1.78 | 1.82 | 1.87 | 1.91 | 1.96 | 2.00 | 2.05 | 2.10 |
| 2.15 | 2.21 | 2.26 | 2.32 | 2.37 | 2.43 | 2.49 | 2.55 |
| 2.61 | 2.67 | 2.74 | 2.80 | 2.87 | 2.94 | 3.01 | 3.09 |
| 3.16 | 3.24 | 3.32 | 3.40 | 3.48 | 3.57 | 3.65 | 3.74 |
| 3.83 | 3.92 | 4.02 | 4.12 | 4.22 | 4.32 | 4.42 | 4.53 |
| 4.64 | 4.75 | 4.87 | 4.99 | 5.11 | 5.23 | 5.36 | 5.49 |
| 5.62 | 5.76 | 5.90 | 6.04 | 6.19 | 6.34 | 6.49 | 6.65 |
| 6.81 | 6.98 | 7.15 | 7.32 | 7.50 | 7.68 | 7.87 | 8.06 |
| 8.25 | 8.45 | 8.66 | 8.87 | 9.09 | 9.31 | 9.53 | 9.76 |
©C J Hill 1997. Last modified on 15th March 1998.
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