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What is the difference between PTC and NTC resistors?
MortenBrendefur
positive temperature coefficient vs. negative temperature coefficient
resistance increases or decreases with increase of temperature, respectively.
Wiki User
∙ 11y ago
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Operating range of ntc and ptc thermistor?
That depends on which units we are using. They are models that cover a variety of ranges.
When was PTC Punjabi - Canada - created?
PTC Punjabi - Canada - was created in 2011.
What is the working principle of the thermistor?
A thermistor changes it's resistance depending on temperature. Hence Thermal-Resistor. (Thermistor) It is all to do with the crystal structure of the substance the thermistor is made of. Some increase their resistance as temperature rises, called Positive Thermal coefficient, 'PTC'. Others reduce their resistance with increasing temperature, called Negative Thermal Coefficient. 'NTC'. They can be used in a feedback loop of a simple amplifier and switch circuits, to control temperature of a device. They can be calibrated for use in a current loop, to directly measure temperature, like a thermometer. They can be used to stop surges in start up circuits, initially giving a high resistance until things warm up. Or used to apply a large current and then reduce as things warm up. (Like in the old degaussing coils on a colour CRT).
Why does zener diode have negative temp coeff?
Zener Diodes like all other diodes use a semiconductor P-N junction. The focus of this topic is actually more on the semiconductor characteristics than the diode it self. Semiconductors are not conductors and do not exhibit the same behavior than conductors. In this section free electron band and conductive band are used synonymously and Fermi level is a quantum mechanical term I can roughly define in semiconductor physics for a basic understanding as the kinetic energy of the electron in the highest quantum level. Semiconductors do not have electrons in the conduction band. All electrons are bound in covalent bonds and their valance bands are nearly filled under normal condition. It is required for an external energy to increase the Fermi level of the electrons in the valance energy band to jump the energy gap (forbidden band) into the conduction band. Then the semiconductor becomes conductive. Thermal energy is one type of energy that can raise the Fermi level of the fermions (particularly electrons in this case) in the valance electron band to jump the energy gap into the conduction band. This will increase the probability for an electron to find it self in the conduction band resulting in the semiconductor to become more conductive. In this case we will see that the contribution that thermal energy makes to increase conductivity by raising the Fermi level is much more than the contribution thermal energy makes to increase resistance, by making the atoms vibrate more, increasing collusions between electrons. This cause the semiconductor to form NTC (negative temperature coefficients), The higher the temperature the better it conducts within normal boundaries. With conductors, they already have electrons in conductive bands and by adding energy to it will not make that much difference in the amount of free electrons (conductivity). This cause a very small contribution to increasing conductivity. But the contribution to increase resistances are far greater due to the vibration of the atom causing more collisions between electrons. This give conductors a PTC (positive temperature coefficient) in normal conditions and cause the electrical resistance to increase when temperature increases. One can also take note that not only silicon Si and germanium Ge are semiconductors, but carbon only appear to be a conductor because it conducts electricity and often misunderstood on "school science" level. It is actually a semiconductor and also have NTC (negative temperature coefficients). Graphite can conduct electricity due to the vast electron delocalization within the carbon layers, a phenomenon called aromaticity. These valence electrons are free to move, so are able to conduct electricity. However, the electricity is only conducted within the plane of the layers.
What is height of sharry maan a Punjabi singer?
itni jada hai k main bata hi nahi sakta mere khayal se his height is 5'6' bcoz when he is standing nearby diljit dosanjh in ptc punjabi music awards he is only a little bit shorter than diljit whose height is approx 5'8' i can say this bcoz i saw him when he came to pacific mall in delhi
What is the difference between ntc and ptc?
NTC is resistance decreases as the temperature increases. NTC are made up of metal oxides from elements such as iron, copper, manganese, nickel and titanium. NTC are very reliable and can operate accurately at relatively high temperatures. NTC are uses in thermostats, ovens, engines and laboratory, industrial and manufacturing processes. PTC resistance increases as the temperature increases. PTC is many applications that benefit from their temperature measuring capabilities. PTC is semi conductive resistors made from polymers or polycrystalline ceramic materials. PTC are used in apparatuses such as motors and self-regulating heaters, and in time-delay, liquid level and air-flow equipment. PTC will offer the amount of resistance required to regulate temperatures or limit currents, therefore protecting the application from damage.
Fullform of ntc and ptc?
ntc: negative temperature coefficient ptc: positive temperature coefficient
Is a NTC thermistor different from PTC thermistor?
Yes, NTC stands for Negative temperature coefficient. This means the resistance goes down as temperature goes up. A PTC has a positive temperature change. As temp goes up, the resistance will increase also.
Operating range of ntc and ptc thermistor?
That depends on which units we are using. They are models that cover a variety of ranges.
What are the types of resistors its application and uses?
This seems like a question from an electrical course, and is probably best answered by your course materials. It's your test question, not ours, and there won't always be someone to ask for the answer. Earn your diploma.
What is the relationship between resistance and temperature?
• ntc 'negative temperature coefficient': its resistance decreases as the temperature increases• ptc 'positive temperature coefficient': its resistance increases as the temperature increases
What is the market cap for PTC Inc PTC?
As of July 2014, the market cap for PTC Inc. (PTC) is $4,464,804,555.68.
What is the symbol for PTC Inc in NASDAQ?
The symbol for PTC Inc. in NASDAQ is: PTC.
When was PTC Alliance created?
PTC Alliance was created in 1924.
What does PTC mean in a court?
Pre -Trial Conference.
Can two parents who can taste ptc have a child who can't?
you cannot have children that can not taste PTC if both of the parents can both taste PTC because of the genotype , so therefor the children can taste PTC
When was PTC Punjabi - Canada - created?
PTC Punjabi - Canada - was created in 2011.
