flippityflop1
- Jan 27, 2009
- 135
- Joined
- Jan 27, 2009
- Messages
- 135
a simple question...
so i have to create 8A DC for a very simple section of a circuit for 2-3 seconds. it draws it's power from the 120 VAC mains.
i will rectify the AC and condition it witha capacitor, but i cannot use a voltage regulator and/or a transformer before or after the rectification (don't ask).
so, i'll simply use a resistor to drop the voltage by 72V. the remaining, to the load, so the whole current is 8A. also, the load needs no regulation.
the question is, can this resistor:
(http://www.digikey.ca/product-detail/en/PF2472-8R2F1/PF2472-8R2F1-ND/2448327)
handle nearly 600W, when this is only specified for 100W, considering it will only be conducting for only 2-3 seconds?
duty cycle is 1-2 every other hours, just in case if the resistor will deteriorate anyways, i have an estimate how long it will last.
so i have to create 8A DC for a very simple section of a circuit for 2-3 seconds. it draws it's power from the 120 VAC mains.
i will rectify the AC and condition it witha capacitor, but i cannot use a voltage regulator and/or a transformer before or after the rectification (don't ask).
so, i'll simply use a resistor to drop the voltage by 72V. the remaining, to the load, so the whole current is 8A. also, the load needs no regulation.
the question is, can this resistor:
(http://www.digikey.ca/product-detail/en/PF2472-8R2F1/PF2472-8R2F1-ND/2448327)
handle nearly 600W, when this is only specified for 100W, considering it will only be conducting for only 2-3 seconds?
duty cycle is 1-2 every other hours, just in case if the resistor will deteriorate anyways, i have an estimate how long it will last.
