In this context the material is called a photoresistor ( also called light-dependent resistor or photoconductor ).

They sometimes have a light-sensitive component ( such as a photoresistor ) which activates them only when it is dark enough for them to be required or activate automatically in dark weather.

# A photoresistor is used to detect the light from the pilot lamp.

An automatic exposure unit from an 8 mm video format | 8 mm movie camera, based on a galvanometer mechanism ( center ) and a Cadmium sulfide | CdS photoresistor in the opening at left.

An automatic light meter / exposure unit from an 8mm video format | 8 mm movie camera, based on a galvanometer mechanism ( center ) and a Cadmium sulfide | CdS photoresistor, in opening at left.

** R Devices without junctions, e. g. cadmium sulfide in a photoresistor

The sensor can be a photoresistor, a photodiode, a phototransistor, a silicon-controlled rectifier ( SCR ) or a triac.

For example, a photoresistor circuit may sense ambient light to turn on a street lamp at dusk.

When the pilot light goes out, electrical circuitry connected to the photoresistor shuts off the gas valve.

William Styron, while facing the changing economy with a certain uneasy reluctance, insists he is not to be classified as a Southern writer and yet includes traditional Southern concepts in everything he publishes.

The main question raised by the incident is how much longer will UN bury its head in the sand on the Congo problem instead of facing the bitter fact that it has no solution in present terms??

This is the question now facing President Kennedy: How to put a stop to the Soviet buildup in Cuba and to Communist infiltration of this hemisphere??

-- and yet he is facing, daily and nightly, people who would gladly see him dead, and he knows it.

Sprinkel strongly refuted the current neo-stagnationist thesis that we are facing a future of limited and slow growth, declaring that this pessimism `` is based on very limited and questionable evidence ''.

An exception is the granular poison frog ( Oophaga granulifera ) where the male and female place their cloacae in close proximity while facing in opposite directions and then release eggs and sperm simultaneously.

Hastings is a man who is capable of great bravery and courage, facing death unflinchingly when confronted by The Big Four and possessing unwavering loyalty towards Poirot.

Using two anchors set approximately 45 ° apart, or wider angles up to 90 °, from the bow is a strong mooring for facing into strong winds.

In the river, facing the town, is a succession of equally productive islands.

This is a building with circular tower and doors facing the cardinal directions.

The highly successful metal pressure tube anemometer of William Henry Dines in 1892 utilized the same pressure difference between the open mouth of a straight tube facing the wind and a ring of small holes in a vertical tube which is closed at the upper end.

Li ' l Abner has one odd design quirk that has puzzled readers for decades: the part in his hair always faces the viewer, no matter which direction Abner is facing.

" At bat ", " up ", " up at bat ", and " at the plate " are all phrases describing a batter who is facing the pitcher.

In Major League Baseball, the National League Championship Series ( NLCS ) is a round in the postseason that determines who wins the National League pennant and advances to Major League Baseball's championship, the World Series, facing the winner of the American League Championship Series.

The right side ( facing forward ) is starboard and the left side is port.

Whenever a player accepts doubled stakes, the cube is placed on his side of the board with the corresponding power of two facing upward.

Barcelona is located on the northeast coast of the Iberian Peninsula, facing the Mediterranean Sea, on a plain approximately wide limited by the mountain range of Collserola, the Llobregat river to the southwest and the Besòs river to the north.

:" Birka is the main Geatish town ( oppidum Gothorum ), situated in the middle of Sweden ( Suevoniae ), not far ( non longe ) from the temple called Uppsala ( Ubsola ) which the Swedes ( Sueones ) held in the highest esteem when it comes to the worship of the gods ; here forms an inlet of the Baltic or the Barbaric Sea a port facing north which welcomes all the wild peoples all around this sea but which is risky for those who are careless or ignorant of such places ... they have therefore blocked this inlet of the troubled sea with hidden masses of rocks along more than 100 stadions ( 18 km ).

:" In pity of their errors, our archbishop ordained as their diocesan capital Birka, which is in the middle of Sweden ( Sueoniae ) facing Jumne ( Iumnem ), the capital of the Slavs, and equally distant from all the coasts of the surrounding sea.

The Greek Revival façade facing Great Russell Street is a characteristic building of Sir Robert Smirke, with 44 columns in the Ionic order high, closely based on those of the temple of Athena Polias at Priene in Asia Minor.

There is an immediate intuition on the amount of peril a rabbit is facing.

A monotonic path is one which starts in the lower left corner, finishes in the upper right corner, and consists entirely of edges pointing rightwards or upwards.

The hole is called a " dogleg left " if the hole angles leftwards, and a " dogleg right " if the hole angles rightwards.

Thus one head is slanted slightly leftwards and the magnetic gap of the other head slanted slightly rightwards.

-- liberal considers that the need for a national economy with controls that will assure his conception of social justice is so great that individual and local liberties as well as democratic processes may have to yield before it.

Why, in the first place, call himself a liberal if he is against laissez-faire and favors an authoritarian central government with womb-to-tomb controls over everybody??

Hence government must establish greater controls upon corporations so that their activities promote what is deemed essential to the national interest.

In covert socialism -- toward which America is moving -- private enterprise retains the ownership title to industries but government thru direct intervention and excessive regulations actually controls them.

It is equipped with electronic controls that can be set to hold precise tension and speed.

the Athletic program at Carleton is considered an integral part of the activities of the College and operates under the same budgetary procedure and controls as the academic work.

We know now that a 15-degree differential in temperature is the maximum usually desirable, and accurate controls assure the comfort we want.

To understand American politics is, simply, to know people, to know the relative weight of names -- who are heroes, who are straw men, who controls, who does not.

The appestat, which adjusts the appetite to keep weight constant, is located, says Jolliffe, in the hypothalamus -- near the body's temperature, sleep and water-balance controls.

The player controls a spaceship in an asteroid field which is periodically traversed by flying saucers.

This listing was removed from CITES in June 2010 by the South African government and South African abalone is no longer subject to CITES trade controls.

This difference in definitions controls whether the pseudorhombicuboctahedron is considered an Archimedean solid or a Johnson solid.

*" The Ballad of Casey Jones " is a traditional song about railroad engineer Casey Jones and his death at the controls of the train he was driving.

In the company of Edwin and his loves are a dramatic array of thinly veiled representations of theatrical personages of the time, amongst them Daniel Mendoza, an exacting and powerful impresario, who controls the lives of his leading ladies ; the goatish, démodé manager, Matthew Lewis, who promotes Julia Scarlet as “ the American Sarah Bernhardt ”; the worldly-wise veteran of the stage, Ottilie Potter, who has gotten where she is because, “ Men had what I wanted, and I had what they wanted ”; and the huge, manlike Helen Sampson, chief among theatrical agents.

A color television system is identical except that an additional signal known as chrominance controls the color of the spot.

The term suggests that its followers support protectionism and / or nationalism, which is not always the case-in fact, some supporters of anti-globalization are strong opponents of both nationalism and protectionism: for example, the No Border network argues for unrestricted migration and the abolition of all national border controls.

* Specimen geometry is uncontrolled, yet controls projection behaviour, hence little control over the magnification.

The intention is to give operators economic incentives to install pollution controls.

The Ministry of Telecommunications controls all telecommunications originating within the country through its carrier unitary enterprise, Beltelecom, which is controlled as a monopoly.

The objective is to ensure the stability and efficiency of the system and compliance to rules and regulations ; the bank pursues it through secondary legislation, controls and cooperation with governmental authorities.

Opposing players may try to regain control of the ball by intercepting a pass or through tackling the opponent who controls the ball ; however, physical contact between opponents is limited.

* shadow director-an individual who is not a named director but who nevertheless directs or controls the company

Thus, a player should use Blackwood only when he can ascertain that the partnership holds at least second-round controls in all suits ( kings or, if a suit fit is found, singletons ).

The defining component of a computer is the central processing unit ( CPU, or simply processor ), because it operates on data, performs computations, and controls other components.

Due to the meandering of the Danube, the eastern border of Baranja with Serbia according to cadastral delineation is not followed, as each country controls territory on their side of the main river flow.