What is the Meaning of Battery is Shorted and What Happens When It is Shorted?

  • Thread starter Thread starter app
  • Start date Start date
  • Tags Tags
    Current Heating
AI Thread Summary
The discussion revolves around understanding the term "battery is shorted" in the context of electrical circuits. A shorted battery refers to connecting a wire with negligible resistance directly across the battery terminals, creating a short circuit. This condition can lead to excessive current flow, potentially causing overheating or damage to the battery. The maximum power transfer occurs when the external resistance equals the internal resistance of the battery, which is a key point in circuit analysis. Clarification on the implications of short circuits and their effects on battery performance is sought, emphasizing the importance of grasping fundamental concepts in electrical engineering.
app
Messages
46
Reaction score
0
INTRODUCTION:Here is a problem on "Heating Effect Of Current".I can't understand a part of it.
EXACT PROBLEM: "A battery of emf E and internal resistance r is supplying current to an external resistance R.(a)Show that the power dissipated in R will be maximum when R=r.(b)What is the maximum power?(c)What would happen if the battery is shorted?"
WHAT MY BRAIN SUGGESTED:(a)The current in the circuit is i=E/(R+r).Power dissipated is P=(i^2)r.Now putting the value of i, we find that P will be maximum when denominator is minimum,i.e. (R-r)^2 is 0. So, R=r.
(b)Putting r in place of R in the power equation, we get maximum power as (E^2)/4r.
(c) ***ERROR***The word "shorted" is not yet registered in the PHYSICS part of my brain .BRAIN CANNOT SUGGEST ANYTHING.SORRY.
CONFUSION:What does "battery is shorted" mean?And what would happen if the battery is shorted?
CONCLUSION:Physics Forums say that it is necessary to show that one has tried a particular problem in order to be answered.But what can one do if he cannot understand the meaning of a term?(I don't know what exactly "shorted" is).How will i prove that I've really tried part (c)?Nevertheless, I've tried to show that i know the other things of "Heating Effect Of Current".If you still don't believe me i have nothing to say. But if you do help me, thank you in advance.
 
Physics news on Phys.org
Hello, I think shorted implies a short circuit, and the heating effect of current is joule heating--Joule's Law.
 
"The battery is shorted" means that instead of connecting an external resistance across the battery terminals you connect a plain conducting wire across them. Assume the wire has zero resistance and thus creates the so-called "short circuit".
 
so in this case, what would happen if the battery is shorted. plesae explain. it is the first time I'm coming across short circuit problems. thanks.
 
Just redo your analysis, only this time have R = 0.
 
thanks a lot.
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

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...
View full post »
Thread 'Variable mass system : water sprayed into a moving container'

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}...
View full post »

Similar threads

Circuit with potential difference across battery being zero?
Replies
3
Views
1K
Why do the headlights on the car become dim when the car is starting?
Replies
4
Views
2K
What Happens to the Current Through R1 When E2 is Short Circuited?
Replies
6
Views
1K
Circuits and the percent change of current when the switch is closed
Replies
2
Views
2K
Batteries in series, parallel, and internal resistance
Replies
24
Views
5K
Identical Batteries in Parallel do not Draw Same Current, Non-Ideal?
Replies
7
Views
888
Electric Potential across charging battery.
Replies
5
Views
2K
I''What is the optimal resistance for maximizing battery terminal voltage?
Replies
2
Views
1K
Circuits ... what is this question asking?
Replies
6
Views
1K
Joule heating effect - qualitative explanation
Replies
8
Views
2K

Hot Threads

Recent Insights

Back
Top