- #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
AI Thread Summary
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:
Kindly see the attached pdf. My attempt to solve it, is in it.
I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction.
I'm not able to figure out, why my solution is wrong, if it is wrong .
TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance)
My thoughts for the first case , one of them must be 12 volt while the other is 0
The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
Here is what I tried
This question was actually asked in one of our engineering entrances.
The answer was 1D.
My teachers say that we have to use μₘ/fₘ to get to this answer. I cannot understand why. I'll be really glad if you could tell me the exact definition of power (numerically) that works in all scenarios.
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