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

Realize the following boolean expression, Q. Using a minimum number of NAND...

Q. Using a minimum number of NAND gates, realize the following Boolean expression: F(A,B,C) = ∑ mi (0, 3, 4, 5, 7).

Define sampling frequency, Define Sampling Frequency? Since real analog...

Define Sampling Frequency? Since real analog signals consist of several frequencies, spectrum of the input signals should be limited to make sure that no signal energy exists a

Ani immediate with accumulator instruction , ANI AND Immediate  with Accum...

ANI AND Immediate  with Accumulator Instruction 8 bit  data specified  in the  instruction is logically  AND with the  contents  of the  accumulator. The result is stored  in

Explain load flow analysis, Explain Load Flow Analysis The method commo...

Explain Load Flow Analysis The method commonly used for load flow analysis is the nodal analysis. The nodal analysis method is given in many books on circuit theory and is base

Binary coded decimal to decimal conversions, Binary Coded Decimal to Decima...

Binary Coded Decimal to Decimal Conversions • Step1. Break up the Binary Coded Decimal number into 4 bit binary number, starting from the least significant binary bit. • Step2

Find the current in resistance, Q. Obtain the Thévenin and Norton equivalen...

Q. Obtain the Thévenin and Norton equivalent circuits for the portion of the circuit to the left of terminals a-b in Figure, and find the current in the 200- resistance.

Calculate the active and reactive power, The variable resistor Z o in the ...

The variable resistor Z o in the circuit shown in Fig. 1  is adjusted until maximum average power is delivered to Zo. a)  Find the value of Z o b)  Calculate the maximum av

Basic macroeconomic policy trilemma for open economies, Q. Explain th...

Q. Explain the basic macroeconomic policy trilemma for open economies. Answer: Of three goals mainly countries share - independence in financial policy and stability in t

Solve for amplitude and phase of the current and the voltage, Use PSpice to...

Use PSpice to solve for the amplitude and phase of the current and the voltage across the inductor in the circuit shown in Figure(a).

Determine the maximum value of the voltage, Q. Three waveforms seen on an o...

Q. Three waveforms seen on an oscilloscope are shown in Figure. If the horizontal scale is set to 50 ms per division (500 ms for the entire screen width), and the vertical scale is

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