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What determines the power dissipation of a resistor?
To find out, we need to be able to calculate the amount of power that the resistor will dissipate. If a current I flows through through a given element in your circuit, losing voltage V in the process, then the power dissipated by that circuit element is the product of that current and voltage: P = I × V.
Power is defined in Physics as the ability to do work. In this context this means either to physically move something or generate heat. The amount of heat that flows depends on the temperature of the environment or ambient temperature and the thermal resistance between the material and the environment.
What does the power developed in a resistor depend on?
Every resistor has a maximum power rating which is determined by its physical size as generally, the greater its surface area the more power it can dissipate safely into the ambient air or into a heatsink.
What is the relation between the resistor and the temperature?
I know that in transsitor the relation between the power dissipation and the temperature is given by: Pd = (Tj-Ta)/theta (ja), I try to find the relation of the resistor dissipation but i didn’t find anything helpful! Thank you for your help. The relationship in both cases is Temperature Rise = Power * thermal resistance.
This correlation follows Ohm’s law, which states the formula for current as I (current) = V (voltage) ÷ R (resistance). In the field of electronics, power dissipation is also a measurement parameter that quantifies the releasing of heat within a circuit due to inefficiencies.
System designers and board designers have to design their board to handle the heat generated due to power consumption in the ICs. A good understanding of thermal resistance and its implication on power dissipation and heat generation is essential.
How is power dissipation related to junction temperature?
Thus, a higher θ Ja value leads to higher junction temperature for a given amount of power dissipation. The power dissipation for Micrel’s MIC94060 switch is calculated as: R ds (on) × I out ×I out where R ds (on) is the on-resistance of the switch and I out is the load current or output current.