Write a short note on heat sink, Electrical Engineering

Assignment Help:

Q. Write a short note on heat sink

For transistors handling small signals ,the power dissipated at the collector is small.Such transistors have little chances of thermal runaway .However in power transistors ,the power dissipated at the collector junction is larger .This may cause the junction temperature to rise to a dangerous level .We can increase the power handling capacity of a transistor if we make a suitable provision for rapid conduction of heat away from the junction .This can be achieved by using a sheet of metal called heat sink.As the power dissipated within a transistor is predominantly the power dissipated at its collector base junction ,sometimes the collector of the power transistor is connected to its metallic base The case of the transistor is then bolted on to a sheet of metal .The sheet serves a heat sink. Connecting heat sink to a transistor increases the area from which heat is to be transferred to the atmosphere .Heat moves from the transistor to the heat sink by conduction ,and the it is removed from sink to the ambient by convection and radiation.


Related Discussions:- Write a short note on heat sink

Electron beam focused to a fine spot, Q. How is the electron beam focused t...

Q. How is the electron beam focused to a fine spot on the face of the CRT? Sol. The functional diagram of an electrostatic focusing arrangement is shown below. The pre-accele

Determine the amplitude - radar system, Suppose the ambiguity function of s...

Suppose the ambiguity function of some waveform x ( t ) of duration ζ = 1 millisecond is given by   (NOTE: this is not a possible AF because it is not time-limited to

Determine the minimum number of poles for the motor, Q. From a three-phase,...

Q. From a three-phase, 60-Hz system, through a motor-generator set consisting of two directly coupled synchronous machines, electric power is supplied to a three-phase, 50-Hz syste

Define a voltmeter, Define a voltmeter A voltmeter is an instrument us...

Define a voltmeter A voltmeter is an instrument used to measure p.d. and must be linked in parallel with the part of the circuit whose p.d. is required.

Explain synchronisation and parallel operation, Explain Synchronisation and...

Explain Synchronisation and Parallel Operation Generation, transmission and distribution of electric power have to be conducted in an efficient and reliable way at a reasonable

Digital modulation using matlab, hi I want the code of digital modulation i...

hi I want the code of digital modulation in matlab with inputs binary bit stream and M-ar

Long-term plans for technical loss reduction, Long-Term Plans for Technical...

Long-Term Plans for Technical Loss Reduction Long-term measures for technical loss reduction include all measures that require to be taken for the improvement of quality and r

Explain basic input output system function call, Discuss BIOS function call...

Discuss BIOS function call with one example. BIO stands for Basic Input Output System: This is a set of programs to give most basic low-level services as services keyboard, s

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd