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As power is defined as the rate of energy transfer, 'power dissipation' is a measure of the rate at which energy is dissipated, or lost, from an electrical system. When an electric current does work on a conductor, the internal energy of that conductor increases, causing its temperature to rise above the ambient (surrounding) temperature. This causes energy to dissipate away from the conductor into the surroundings, through the process of heat transfer. The rate of this heat transfer (joules per second) is termed 'power dissipation' (in watts).
This is power that is converted to heat and then conducted or radiated away from the device. Electronic and electric devices can have a limit on the current they can safely handle that is not an electronic limit, but a physical one. For instance, a transistor may otherwise be able to handle a certain amount of current, but it is given a lower current rating because the die gets too hot.
Dissipation is usually measured in watts, and uses the usual Ohm's law calculations for power:
P = I^2 * R
or
P = E * I
Electrical wiring in your house dissipates power, so does the speaker in your stereo, as well as motors, integrated circuits, anything that carries electrical current and has some inherent resistance (which is everything pretty much, except maybe superconductors!).
Power dissipation is usually an unwanted effect, unless you are trying to build an electric heater!
It is wasted power to keep the device quiescent and operational.
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What are the different types of power dissipation?
static power dissipation dynamic power dissipation short circuit power dissipation
What is the difference between power consumption and power dissipation?
A: POWER consumption is total power usage power dissipation is wasted power in the form of heat, IR drop and so on.
What are the limitations on forward bias?
A: That will be the power dissipation of the device itself
What are the limitations of norton's theorem?
norton's theorem is valid only for linear elements.. The power dissipation across norton equivalent circuit in not identical with the power dissipation in real system circuit...
How do you explain the MOSFET power dissipation?
It will make more sense if you first study the construction of MOSFET. It has three terminals, Gate (G), Source (S), and Drain (D). G is insulated from the S and D. Between S and D is a variable resistor, whose resistance depends on the voltage applied across G and S. Since SD is basically a resistor, you have power dissipation when a voltage is applied across S and D. Power dissipation = Vds * Ids.
What are the different types of power dissipation?
static power dissipation dynamic power dissipation short circuit power dissipation
What is the difference between power consumption and power dissipation?
A: POWER consumption is total power usage power dissipation is wasted power in the form of heat, IR drop and so on.
What is the power dissipation for TTL?
power dissipation of a logic circuit is usually defined as the supply power required for the gate to operate with a 50% duty cycle at a specific frequency.
What is the key difference between old computers and the present day computers?
vacuum tubes, large sized, high power dissipation, high voltagestransistors, medium sized, medium power dissipation, low voltagesintegrated circuits, small size, medium power dissipation, low voltagesmicroprocessors, very small size, low power dissipation, low voltages
Can power dissipation be prevented?
A: All devices have some kind of power dissipation. That is because some quiescent current must flow to keep them alive or functional
What is the formula to calculate power dissipation?
P=ir2
Which of the technology results in least power dissipation?
CMOS
Which logic family has lowest power dissipation?
cmos
What is heat dissipation in a circuit?
Power isn't really dissipated in a circuit. It's energythat is dissipated. So the expression, 'power dissipation', really means is the 'rate of energy dissipation'.So, when an engineer asks, "What is the power dissipation?", what he is actually means is "What is the rate of energy dissipation?"What is energy dissipation? Well, work is done whenever a current flows through a conductor; this increases the internal energy of that conductor which, in turn, causes its temperature to rise. Because the temperature of the conductor is higher than the surrounding temperature, energy is lost to the surroundings through heat transfer.
Why resistor size does not varies with its value?
A: A resistor size is determined by the usage or its power dissipation. the bigger the size the more power it can dissipate due to the extra surface. SIZE is a function of power dissipation and has nothing to do with its value
What are the limitations on forward bias?
A: That will be the power dissipation of the device itself
What are the limitations of norton's theorem?
norton's theorem is valid only for linear elements.. The power dissipation across norton equivalent circuit in not identical with the power dissipation in real system circuit...
