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Resistance and Power Loss    
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Joined: 16 Aug 2007
Posts: 44

PostPosted: Sat Jun 23, 2012 9:04 am    Post subject: Resistance and Power Loss Reply with quote

I am wondering if when you have a resistor in a circuit this always represents some power loss does it not? Would like to know if there is a certain amount of resistance that wastes the most power as I will give an example if you have power supply with enough power to supply a light bulb and you insert 1 ohm resistor you would not have much power loss in the resistor and bulb would still get almost all power, then as you increase resistance to 1000 ohms resistor would waste more power bulb would start getting less power then if you put a 100 meg resistor in between power supply and bulb the bulb wound not get much power and I believe the resistor would not waste much power. So as resistance goes up bulb burns less bright, but when you go from 1 ohm to 100 meg resistance is there any way to figure out at what point the resistor would be wasting the most amount of current as it seems to me that a 1 ohm and a 100 meg resistor would waste the least amount of current and some where in between would be where the resistor wastes the most amount of current and where would this be assuming the supply and load are always constant?

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Joined: 28 Dec 2006
Posts: 2852
Location: Overland Park, KS

PostPosted: Sat Jun 23, 2012 2:49 pm    Post subject: Reply with quote

Power = current^2 * R
R = LightBulb + resistor combined
I = Voltage source / R

IN general, Power(max)= when your resistor is small.
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