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peripatein
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Homework Statement
Assuming I have a 20V source on a “power resistor” which can withstand powers of up to 5 Watts on average before it excessively heats and damage begins. What is the DC current that runs through a resistor of 33ohm? What is its power dissipation? What is the maximal DC current I may run through it without damage, I5W? I am then asked to determine the maximal duty cycle allowed so the active load remains undamaged?
Homework Equations
The Attempt at a Solution
I found the DC current running through the resistor of 33ohm to be equal to 20/33=0.6A. The power equals I2R=11.9W. I5W=sqrt(5/33)=0.39A. Could the maximal duty cycle be found by simply dividing I5W by the first current, i.e. 0.39/0.6? If so, I am not quite sure why that is. Could someone kindly explain?