The power-dissipation tag has no wiki summary.
7
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1answer
257 views
How to choose correct resistor with proper wattage and ohms for 6 leds connected in a serial circuit?
Let's suppose I've six LED lights with each 3.2 Volt and 20mA and all six of them are connected in one serial circuit. I know there is better setup but for this I'm using this circuit setup.
I'm ...
5
votes
2answers
120 views
Is it possible to calculate how much heat dissipation and temperature rise will take place in a resistor
Suppose I have a 100 mAh battery at 20V. I connect a 1000 kohm resistor across it. How much heat will be generated and how can I find the temperature rise in the resistor? As the battery operates I ...
4
votes
2answers
177 views
Overheating Problem?
I have almost no electrical experience, so I apologize about the simplicity of the question in advance.
I have 4 resistors a diode and a transistor in a 22mm x 14mm x 8mm enclosure.
My concern is that ...
3
votes
3answers
92 views
Mosfet heat calculation question
I am using the FQP30N06L mosfet. http://www.fairchildsemi.com/ds/FQ/FQP30N06L.pdf
As far as I understand the data sheet. If I connect 5V to the gate and run 2A through drain to source then with a ...
2
votes
2answers
159 views
Would replacing a resistor by another one of identical value but higher power rating affect the working of a circuit?
The schematic recommends using 20 Ω 1W as collector resistance.
What I have at hand are two 10 Ω rated for 10W. I'm guessing the change should be acceptable ...
What difference would it ...
1
vote
3answers
247 views
Can a soapbox-sized device dissipate 10-15W of heat? If yes, how?
Some time ago, I built a soapbox-sized battery testing device. One of its functions was to discharge batteries at a specified current, and it handled most of the common battery sizes well, but its ...
1
vote
1answer
416 views
Wattage calculation for resistors in series
I need the formula for calculating resistor wattage when the resistors are in series. For example, say I have 3 1/4 watt 10 ohm resistors in series. What is the potential power dissipation for the ...
1
vote
2answers
106 views
MOSFET for PWM application
I'm designing an application where a power logic level MOSFET is driven using a 5V PWM signal at 20kHz.
The drain current will be approx. 10A and the voltage of the load 12V.
I looked into the ...
1
vote
2answers
129 views
How many watts will the resistor in this naîve PSU dissipate?
One would be inclined to think the average current on resistor R would be exactly the same as in the load L, but I'm not so sure of that fact, due to the effect of the (big, 1000uF+) capacitors. ...
0
votes
2answers
163 views
Using a voltage divider on LED IC driver output
Would using a voltage divider on the outputs affect the drivers operation?
The Driver is a 24 channel current sink IC that will be used for automotive interior lighting.
LED will have a Vf of 3.3v @ ...
-1
votes
1answer
158 views
How the problem of dark silicon is/will be solved?
I read in this article that within a couple of years about 21% of transistors will have to be switched off some time, else the chip will cross its limit of heat dissipation.
What general techniques ...
