6

Equivalent resistances

Introduction

Resistors can be bought in certain standard values. The ranges of values are commonly called the E6, the E12 and the E24 series, the numbers denoting the quantity of values per decade of resistance. For building or repairing low voltage electronic circuits most workshops will stock a full range of E12 or E24 miniature resistors (i.e. 1/8 Wor 1/4 W power rating), usually 1 or 2% tolerance, plus a selection of resistors rated at higher powers, which are available in combinations of E6 and E12 values. An additional range, E96, is also available, but these are more expensive, 0.1 % tolerance, and few workshops will stock them as standard due to the large number of values. Also they are hard to obtain below ...

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