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Thermal runaway is not possible in FET because as the temperature of FET increase?
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∙ 12y ago
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∙ 12y ago
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What is the effect of temperature on transistor?
conductivity of semiconductors increases with increase in temperature as breakdown of covalent bonds take place in the semiconductor due to increase in temp but more & more increase in the temp may result in the breakdown or damage of the semiconductor which results in the decrease in conductivity of semiconductor
Why semiconductor has negative temperature coefficient of resistance?
Actually, the BJT is a positive temperature coefficient device. As they get warm, hFe increases, causing more current flow. This can lead to thermal runaway. That is why most class A common emitter configurations use an emitter resistor to place limits on the hFe demand, eliminating thermal drift and runaway.
What are the possible remedies against corona because of extra high voltage?
increase the size of conductor ,provide the hallow conductor,increase the critical disruptive voltage bv providing shunt capacitors. these capacitors increases the power capacity of the line.
What is the effect of temperature on ohms law?
AnswerOne of the conditions for Ohm's Law to apply is that the temperature of a conductor MUST remain constant. And, unfortunately, this is difficult to achieve because as the applied voltage increases, the resulting current causes the temperature of the conductor to rise -thus negating Ohm's Law!!For Ohm's Law to apply, the ratio of voltage to current must remain constant for variations in voltage. If it doesn't, then the conductor/device is NOT obeying Ohm's Law. Period! So if, for example, you increase the voltage across a lamp, you will find that the ratio varies as the voltage increases, and this is because the resistance is increasing due to an increase in temperature. So, in this example, the temperature is the reason why lamps don't obey Ohm's Law.
What does this mean Current density of copper bussbars shall not exceed 1000 amperes per square inch I know it's self explanitory but would be the problem if the current density was too high?
Well as you said, it is self explanatory. The current density should not be more than 1000 A per square inch roughly coming to about 1.6 Ampere per square mm. Consider the case when the current density is high i.e. it could be high because of either reduced area with same current OR with more current through same area. Any of this case would lead to increase in the thermal lossess which could eventually lead to thermal runaway without the temperature rise getting stabilized (Stability being defined as temperature rise not exceeding 1 deg C per hour). Rgds, Fency Anthony, ABB Limited, India
Thermal runaway is not possible in FET because of?
Thermal runaway is not possible in FET because of?
How does mass affect thermal energy?
The thermal energy of any substance is the product of its specific heat and the temperature difference between it and the surroundings. So if you increase the temperature you directly increase the thermal energy, in proportion to the difference between its temperature and ambient temperature.
Why does thermal energy depends on temperature?
Thermal energy relies on temperature because it uses the heat to produce energy.
Heat is the transfer of thermal energy because of difference?
Heat is not the transfer of thermal energy. Heat is the thermal energy. What drives itacross a boundary between substances or objects is a difference in their temperatures.
Does two objects at different temperature have same thermal energy explain?
No,two objects at different temperature does not have the same thermal energy because both objects have different temperature .object with high temperature has more thermal energy and the object with low temperature has less thermal energy.
How can you add thermal energy to a substance without increasing the temperature?
You can add thermal energy to a substance without increasing its temperature by adding hot water. As the thermal energy of the substance increases, the particles of the substance expands. That is how you can open a bottle by putting it under hot water.
What is the effect of temperature on transistor?
conductivity of semiconductors increases with increase in temperature as breakdown of covalent bonds take place in the semiconductor due to increase in temp but more & more increase in the temp may result in the breakdown or damage of the semiconductor which results in the decrease in conductivity of semiconductor
How does combining two substances of the same temperature increase the thermal energy of the mixture?
the answer is completely obvious so get the answer yourself because I am not telling, have a good day dummies;0
How is thermal energy different from temperature How are they similar?
temperatures differ from thermal energy because differ because thermal energy is the total energy of all particles in an object and temperature is a measure of the average energy of random motion of particles of matter.
How are heat and Thermal energy related?
it is related because heat is temperature and temperature tells how fast molecules move and thermal energy is kinetic + potential energy
Does iron have thermal conductivity?
Yes it does because when it is heated because of temperature then it bends or breaks.
Why as load increase the condenser temperature will also increase?
Because the more the load the more the temperature.
