- #1
ellieee
- 78
- 6
- Homework Statement
- nil
- Relevant Equations
- P=IV
why is answer for (6a)6J?
What does negligible resistance mean?
- Thread starter ellieee
- Start date
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- Mean Resistance
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Negligible resistance indicates that a battery functions as an ideal DC voltage source, maintaining a constant voltage at its terminals regardless of the current drawn. The initial answer of 6J is incorrect. The correct answer is 4J, as confirmed in the discussion. This highlights the importance of understanding the implications of negligible resistance in electrical circuits. The conversation emphasizes clarity in interpreting voltage and power calculations.
why is answer for (6a)6J?
- #2
DaveE
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Negligible resistance means that the battery is a perfect source of DC voltage. The voltage at it's terminals is constant regardless of the current drawn.ellieee said:
The answer is not 6J.
- #3
ellieee
- 78
- 6
then is the answer 4J?DaveE said:
- #4
Steve4Physics
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Yes.ellieee said:
The answer is (B) but I don't really understand why.
Based on formula of Young Modulus:
$$x=\frac{FL}{AE}$$
The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A##
I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...
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