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A positive temperature coefficient (PTC) refers to materials that experience an increase in electrical resistance when their temperature is raised. Materials which have useful engineering applications usually show a relatively rapid increase with temperature, i.e. a higher coefficient.
A positive-temperature-coefficient heating element (PTC heating element), or self-regulating heater, is an electrical resistance heater whose resistance increases significantly with temperature. The name self-regulating heater comes from the tendency of such heating elements to maintain a constant temperature when supplied by a given voltage.
The first term has a negative temperature coefficient; the second term has a positive temperature coefficient (from its ). By an appropriate choice of N {\displaystyle N} and R 1 {\displaystyle R1} and R 2 {\displaystyle R2} , these temperature coefficients can be made to cancel, giving an output voltage that is nearly independent of temperature.
In crystal oscillators for temperature compensation, medical equipment temperature control, and industrial automation, silicon PTC thermistors display a nearly linear positive temperature coefficient (0.7%/°C). A linearization resistor can be added if further linearization is needed. [23]
From the Ramsey family to pedophiles John Mark Karr and Gary Oliva — Boulder police have investigated numerous suspects in the beauty queen's 1996 murder and made no arrests.
The temperature approaches a linear function because that is the stable solution of the equation: wherever temperature has a nonzero second spatial derivative, the time derivative is nonzero as well. The heat equation implies that peaks ( local maxima ) of u {\displaystyle u} will be gradually eroded down, while depressions ( local minima ...
The woman accusing Jay-Z and Sean “Diddy” Combs of sexually assaulting her when she was 13 can proceed anonymously (“at least for now”) in her lawsuit against the rappers, a judge ruled ...
Jimmy Butler wants out of the Miami Heat. There's not much more that can be said about the six-time All-Star after a surreal, two-minute postgame conference following the Heat's 128-115 loss to ...