Resistor: Verskil tussen weergawes

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'n '''Resistor''' (of 'n '''weerstand''') is 'n twee terminaal [[elektronika|elektroniese]] komponent wat weerstand bied teen 'n [[elektriese stroom]] en 'n spanningsval tussen sy terminale veroorsaak in ooreenstemming met [[Ohm se wet]]. (Sekere ultrahoë presisie resistors het 2 addisionele terminale).

== Soorte resistors ==

 

 

=== Vaste resistors ===

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=== Variable resistors ===

The variable resistor is a resistor whose value can be adjusted by turning a shaft or sliding a control. They are also called '''potentiometers''' or '''rheostats''' and allow the resistance of the device to be altered by hand. The term ''rheostat'' is usually reserved for higher-powered devices, above about &frac12; watt.

Variable resistors can be inexpensive single-turn types or multi-turn types with a [[helical]] element. Some variable resistors can be fitted with a mechanical display to count the turns.

 

=== SMD resistors ===

[[Surface-mount technology|Surface mounted ]] resistors are printed with numerical values in a code related to that used on axial resistors. Standard-tolerance [[SMD]] resistors are marked with a three-digit code, in which the first two digits are the first two [[significant digit]]s of the value and the third digit is the power of ten. For example, "472" represents "47" (the first two digits) multiplied by ten to the power "2" (the third digit), i.e. 47 × 10² = 47 × 100 = 4700 Ω. Precision SMT resistors are marked with a four-digit code in which the first three digits are the first three significant digits of the value and the fourth digit is the power of ten.