Re: Electronics 101 Question .....

Posted by Gerald J. on October 25, 2006 at 17:07:10 from (67.0.97.131):

In Reply to: Electronics 101 Question ..... posted by MMB on October 25, 2006 at 15:35:07:

With a fixed voltage, the lower resistance will draw more current and so will dissipate more power. With a fixed current the voltage drop will be greater for the high valued resistor and it will dissipate more power. You can't demand that in a circuit with 6 volts that the 3 ohm resistor will draw 4 amps, nor that that the 10 ohm resistor will draw that 4 amps. And you can't demand that the voltage remain at 6 volts if you insist that the current through either resistor will be 4 amps. So your question is somewhat invalid.

You don't supply enough information in your question to be able to say which resistor will get the hottest. That will depend on the surface area of the resistor available for dissipating that heat.

If the two resistors have indentical physical size and identical power ratings, the resistor dissipating the most power will get the hottest, but if the 3 ohm resistor is rated a 1000 watts, it won't heat much while if the 10 ohm resistor is rated at 100 watts with 4 amps through it (and 40 volts drop) it will dissipate 160 watts and will nearly glow.

Gerald J.

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