What does negligible resistance mean?

  • Thread starter Thread starter ellieee
  • Start date Start date
  • Tags Tags
    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.
ellieee
Messages
78
Reaction score
6
Homework Statement
nil
Relevant Equations
P=IV
Screenshot_20210802_143738_com.android.chrome.jpg

why is answer for (6a)6J?
 
Physics news on Phys.org
ellieee said:
Homework Statement:: nil
Relevant Equations:: P=IV

View attachment 286996
why is answer for (6a)6J?
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.

The answer is not 6J.
 
DaveE said:
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.

The answer is not 6J.
then is the answer 4J?
 
ellieee said:
then is the answer 4J?
Yes.
 
Thread 'Variable mass system : water sprayed into a moving container'
Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
Back
Top