Identify unknown resistors by using the BS8152 codes for values and tolerances. Recognise resistor values when written on circuit diagrams. Identify unknown resistors using a printed numerical code. Select resistors for use in a circuit from the E12 and E24 series values. Use appropriate markings to determine the power rating of a resistor.
The 5% set (also known as the E24 series) has 24 values between 100 and 1000, while the 1% set (also known as the E96 series) has 96 values in the same range. Let's say we need a 230 kΩ resistor based on some calculations. Checking the table we see that the closest 5% value is 220 kΩ, which is 4.3% below our desired value.
Resistors come in a range of tolerances but the two most common are the E12 and the E24 series. The E12 series comes in twelve resistance values per decade, (A decade representing multiples of 10, i.e. 10, 100, 1000 etc), while the E24 series comes in twenty four values per decade and the E96 series ninety six values
E12 series and E24 series are generally used but some resistors with the tolerance under 1% take E96 series and E192 series. The passive components including resistors use this standard value as significant digits and represent constants. E6, E12 and E24. And the last digit indicates a power of ten by which to multiply the given resistor
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e24 series resistor values