Resistive components

thumb|upright=1.2|right|Various resistor types of different shapes and sizes

A thermistor is a semiconductor type of resistor in which the resistance is strongly dependent on temperature. The word thermistor is a portmanteau of thermal and resistor. The varying resistance with temperature allows these devices to be used as temperature sensors, or to control current as a function of temperature. Some thermistors have decreasing resistance with temperature, while other types have increasing resistance with temperature. This allows them to be used for limiting current to cold circuits, e.g. for inrush current protection, or for limiting current to hot circuits, e.g. to pr

A photoresistor (also known as a light-dependent resistor, LDR, or photo-conductive cell) is a passive component that decreases in resistance as a result of increasing illuminance (light) on its sensitive surface, in other words, it exhibits photoconductivity. A photoresistor can be used in light-sensitive detector circuits and light-activated and dark-activated switching circuits acting as a semiconductor resistance. In the dark, a photoresistor can have a resistance as high as several megaohms (MΩ), while in the light, it can have a resistance as low as a few hundred ohms. If incident light

thumb|upright|Metal-oxide varistor manufactured by Siemens & Halske AG. thumb|Modern varistor schematic symbol, which is the same as a thermistor symbol

A potentiometer is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. In motion control systems, potentiometers are frequently used as position sensors to provide analog feedback to a controller, allowing for precise tracking of mechanical movement. If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat.

type of temperature sensor (thermometer)

used to stabilize the current flow in lamps

indicator for the values or ratings of electronic components, very commonly for resistors

electronic component which reduces a signal's amplitude

floating state

incandescent lamp designed to regulate current

miniature adjustable electrical component

electronic component

digitally-controlled electronic component

wire with high resistivity used to create a resistor

resistor whose resistance changes when pressure is applied

dummy resistor

electrical component

resistor used to slowly de-energize a power supply when turned off

Opto-isolator with a photo resistor as optical receiver