0
An LDR (light-dependent resistor) is a particular type of semiconductor (A material with a conduction rating in between that of a conductor and an insulator i.e. electricity flows through a semiconductor slower than through a conductor, but quicker than through an insulator).
Consider an atom as made up of just a nucleus with bound electrons. These electrons require varying amounts of energy to 'escape' from the atom. The semiconductor, as all known matter, is made up of atoms.
Light can currently be explained as being made up of packets of waves called photons where the frequency of these waves determines how much energy they are associated with (Energy = h * frequency: where h is a constant).
Therefore, if light associated with enough energy strikes the semiconductor, then the electrons requiring the equivalent energy to break the bonds will escape.
Electricity is concerned with a flow of electrons, therefore electrons escaping means there is an increase in electrical current.
This increased electrical current is equivalent to a drop in resistance and thus fluctuation in particular frequencies of light affects the resistance of the semiconductor.
Wiki User
∙ 7y ago
Wiki User
∙ 14y agoLDRs actually detect light and depending on the brightness or dimness the LDR will act as a resistor to stop the current from flowing or allowing it to flow
Wiki User
∙ 11y agoldr used in small watches
Wiki User
∙ 12y agoi dont know :L
Wiki User
∙ 13y agotry real.co.uk
Add your answer:
Earn +20 pts
What is the type of ldr commonly used in schools?
automatic
Why LDR used in PIR sensor?
industrial automaton
What is the symbol for ldr?
this is the symbol for ldr
What is an LDR symbol?
An LDR is a Light dependent resistor.
What type of LDR commonly used in schools?
Basically, ETC
What is the meaning of LDR?
LDR refers to Light Dependent Resistor.
How does light affect LDR?
An LDR is a light dependent resistor, which is usually used to detect light levels, either ambient or reflected. The LDR works because incoming light carries energy, which can elevate the energy levels of electrons in a suitable medium to join the 'conduction band' which means that there are more charge carriers in the LDR, and hence the cell has lower resistance.
What does LDR stand for?
Light Dependent Resistor LDR also means long distance relationship.
What is the symbol for LDR Holding Corporation in NASDAQ?
The symbol for LDR Holding Corporation in NASDAQ is: LDRH.
Which material is used in LDR?
Cadmium Sulphide (CdS), Cadmium Selenide (CdSe), Selenium, etc.
In what year did LDR Holding Corporation - LDRH - have its IPO?
LDR Holding Corporation (LDRH) had its IPO in 2013.
What happens to an LDR when a bright light is shined upon it?
When LDR is exposed to light energy . Due to light energy incident on LDR surface, free electron movement of an atom is increased in LDR. This causes high conduction of curent flowing through LDR. beause of free electron movement in LDR, resitance get decreased.
