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Unreasonable Results(a) What is the internal resistance of a 1.54-V dry cell that supplies 1.00 W of power to a $15.0-\Omega$ bulb? (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?
see solutions.
Physics 102 Electricity and Magnetism
Chapter 21
Circuits, Bioelectricity, and DC Instruments
Direct-Current Circuits
Cornell University
Rutgers, The State University of New Jersey
Simon Fraser University
University of Winnipeg
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So in this problem, uh, we have the circuit, so we have the extent over, distant and away have a battery with internal resistance. So this is the Yemen if and this is the internal resistance, this is a kind of external resistance. So in his problem, we we know that the the M F is the 1.54 bolts and the external resistance is 15 homes and we want to make sure that power on the external resister is one waltz. So let's see, the power has expression equal. I squared times our eyes, the current in this Ah, in the circuit. So it equal the m f d a y. Our plants are so square times are so we should said that's equal to one watts. And in this equation, the E. M f is 1.54 words and Ari's with 15 homes so we can get solution for this small right? So solution IAB tennis are equal negative 25th 21 21 homes or are equal native nine homes. So as you can see that the both solution there negative so negative resistance is the actually nonsense that this in this chapter. So this is why this is Ah, unreasonable. And if you want to make this Ah, uh, make this problem reasonable. You should actually said to the power a different value. Like you, sir, said this power actually lower. Lower value. So that is that is that that would be possible.
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