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Why are V-i characterstics different for tungsten and carbon lamp?
As carbon filament bulbs have a negative temperature coefficient and tungsten filament light bulbs have a positive temperature coefficient.
Why aluminum has high thermal expansion coefficient than Copper?
Why aluminium has high thermal expansion coefficient than Copper?"
What is the value heat transfer coefficient of copper?
i think it is 0.000016
What is curie temperature of copper sulphide?
Most Copper and its alloys is non magnetic at room temperature.
What is the colour of copper sulphate at room temperature?
the copper sulphate i used at room temperature was blue.
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
Does a safe reactor have a positive or negative 'temperature coefficient of reactivity'?
negative 'temperature coefficient of reactivity'
Fullform of ntc and ptc?
ntc: negative temperature coefficient ptc: positive temperature coefficient
What is the temperature coefficient of an extrinsic semiconductor is?
positive
What is the difference between positive and negative temperature coefficient of resistance?
Negative temperature coefficient of resistance means that as the temperature of a piece of wire or a strip of semiconducting material increases, the electrical resistance of that material decreases.
What is the temperature coefficient of extrinsic semiconductor?
positive
What is a PTC Relay?
Positive Temperature Coefficient).......by vamsi
What happens when the temperature of a forward biased diode is increased?
What happens depends on the temperature coefficient of the diode. If that diode has a positive temperature coefficient, it resistance increases with increased temperature. A diode with a negative temperature coefficient does the opposite.
What is the difference between PTC and NTC resistors?
positive temperature coefficient vs. negative temperature coefficient resistance increases or decreases with increase of temperature, respectively.
Why do conductor have a positive coefficent?
You mean positive temperature coefficient? Yes conductors as they get heated then due to the nucleii vibrating with greater amplitude would have a grip over the moving electrons and so the resistivity increases with the increase in temperature. Hence positive temperature coefficient.
What does the acronym PTC mean?
1) Positive Temperature Coefficient 2) Positive Train Control.
What materials have positive temperature coefficient?
the materials are silver, aluminum, gold.
