Electronic Symbols and Notation
The symbol used for a resistor in a circuit diagram varies from standard to standard and country to country. Two typical symbols are as follows;
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American-style symbols. (a) resistor, (b) rheostat (variable resistor), and (c) potentiometer
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IEC-style resistor symbol
The notation to state a resistor's value in a circuit diagram varies, too. The European notation avoids using a decimal separator, and replaces the decimal separator with the SI prefix symbol for the particular value. For example, 8k2 in a circuit diagram indicates a resistor value of 8.2 kΩ. Additional zeros imply tighter tolerance, for example 15M0. When the value can be expressed without the need for an SI prefix, an 'R' is used instead of the decimal separator. For example, 1R2 indicates 1.2 Ω, and 18R indicates 18 Ω. The use of a SI prefix symbol or the letter 'R' circumvents the problem that decimal separators tend to 'disappear' when photocopying a printed circuit diagram.
Read more about this topic: Resistor
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