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Questions tagged [batteries]

Devices to store chemical energy and convert it to electrical energy.

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I am having trouble in this question, please someone help me out! [closed]

What is the current supplied from the battery?
Jakson's user avatar
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3 answers
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Battery in non-closed circuit with charged body and Earth

Looking at the clips on how the battery works, I understand that eventually one of the ends releases the electrons which then move through the conductor to the other end, to continue the reaction. Now ...
Boris's user avatar
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5 answers
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Why is my idea of voltage drop wrong?

when battery is connected to 2 ends of a wire, potential difference is created, this causes electric field causing electrons to move, the field gives the electron electric potential and the thus ...
Anton Bert's user avatar
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1 answer
56 views

Doubts in circuit analysis [closed]

I am really confused here how is the potential at O found? Resistance is equal at all resistors this is an illustration in my book, they have not explained why voltage at O is 50V, just stated that ...
Anton Bert's user avatar
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2 answers
48 views

Working of batteries and supply of charges through them when connected to capacitors

My doubt is not really related to capacitance but about the fundamentals of working of a battery. A capacitor with certain capacitance is charged as shown in the figure. Please note that battery is ...
NPC's user avatar
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3 votes
3 answers
508 views

Simulation of a battery with lifting up and role of salt bridge

Usually for explanation of the mechanism of a battery, it is modelled by lifting a mass from lower to higher position. The attached figure shows a mass that goes down due to the gravitational ...
H. Khani's user avatar
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2 votes
1 answer
70 views

Potential difference when two emf sources are connected in a simple loop circuit

I am having difficulty understanding the equation below for the potential difference between the two terminals of an electromotive source when two sources are connected from Sear and Zemansky's ...
nomadicmathematician's user avatar
0 votes
6 answers
149 views

Why is current the same when batteries are connected in series? [closed]

I struggle to understand why the current remains the same in the circuit when batteries are connected in series. Update I can reason with it if someone can confirm the update. If the speed of ...
DPV's user avatar
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2 answers
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Do we have to provide energy to move electrons in an electric field?

In the positive and negative terminal of a battery, there is potential difference due to the accumulation of charges in their respective terminal, so it created a potential difference, and if we ...
Nishesh Tyagi's user avatar
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3 answers
93 views

How do charges on two conductors charged by the same battery relate to each other?

Let’s consider 2 neutral conducting spheres, L and R, with different radii. There is a battery somewhere in the middle between these spheres. The battery has potential $\phi_{B-}$ on its negative ...
Alexandr's user avatar
2 votes
1 answer
81 views

Gibbs phase rule argument about battery voltage dependency on the state of charge

I'm studying battery physics, particularly the dynamics of full discharge, and I am having trouble understanding an argument that is based on the Gibbs phase rule $$F=C-P+2.$$ I understand the phase ...
mike1994's user avatar
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1 answer
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Is it safe to assume it to be a balanced Wheatstone bridge?

If we calculate the potential at both ends of these $3\,\Omega$ and $4\,\Omega$ resistors, that comes out to be the same. It is $V/3$ at both ends of the $3\,\Omega$ resistor and $2V/3$ at both ends ...
Physics_enthus's user avatar
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1 answer
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Current equation for a circuit containing 5 basic elements in series

Does a general equation (for current) exist for a circuit containing the five elements namely e(dc), e(ac), R, L (active/inactive), C (charged/uncharged) in series? If yes, can i derive from it the ...
KPS's user avatar
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-1 votes
1 answer
48 views

How do I create a highly conductive vapor cloud? [closed]

I'm working on a project that requires that I create an electrically conductive gas cloud that can conduct voltages as low as 1.5v from a regular double A battery. I've been looking into using mecury ...
TechDroid's user avatar
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0 votes
2 answers
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Charge on parallel plate capacitor before and after connecting battery

Suppose we have two plates which have unequal magnitudes of charge. When we connect these plates to a battery, why does the charge on both plates become equal and opposite? Why is capacitance defined ...
user1188500's user avatar
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1 answer
75 views

Why does the current increase in this circuit?

I have understood the later parts of the model answer, but why does the current increase? I know that the brightness of a lamp is determined by its power which is given by $P=IV$. Since the current ...
3lsef's user avatar
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1 answer
95 views

Are electrons still present in dead batteries?

After the end of chemical reaction in battery which makes voltage and flow of current, do the electrons existing in copper wire remain there or not?
RUCHI Goyal's user avatar
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2 answers
104 views

Electromotive force by PN junction and extraneous role of electrolyte in electrochemical cells

When the two semiconductors N and P are connected, because of higher Fermi energy, electrons migrate from N to P so that an electric filed is formed in the depletion region (attached picture) which ...
H. Khani's user avatar
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2 answers
71 views

Is a fission-fusion battery physically possible?

I'm not a physicist, so forgive me if this question is obvious, or if I'm detracting from the forum's goals (not sure if this is analogous to math exchange or math overflow). My understanding of ...
JMenezes's user avatar
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3 answers
77 views

Behaviour of current in Pure capacitive circuit with DC voltage across

A circuit has just 1 capacitor and a DC Battery (V volts) and the wire has no resistance. At time $t=0$ the capacitor is completely uncharged. How current in this circuit changes with time? What i ...
SHINU_MADE's user avatar
0 votes
1 answer
55 views

What is the voltmeter measuring the PD of?

In the circuit diagram, the cell has an internal resistance, but when the switch is closed what does the voltmeter measure, the pd of the cell, or the components in series?
John Smith's user avatar
0 votes
3 answers
83 views

Why There's No Current Flowing in This Part of The Circuit?

One time, in my Physic Class my professor ask us, "How much current is flowing in this circuit?" and everyone answer $5$ Ampere (Because, it looks like the resistor is arrange in the series ...
aki's user avatar
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10 votes
3 answers
2k views

How does a wireless charger work if there is no transfer of electrons?

I have read this: the definition of electrical current is the flow of charge. Now, it is also possible to transfer energy (and therefore power) through either free space or a conductor by ...
Árpád Szendrei's user avatar
1 vote
1 answer
45 views

How would having a non-ideal ammeter affect the resistance across this bulb?

A non-ideal ammeter is one that has resistance right. So that means that work will be done by the current flowing through the ammeter and there will be a potential difference across it. This will then ...
3lsef's user avatar
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0 votes
2 answers
38 views

What is the voltage across the capacitor and the charge it stores

Assume the switch has been on for a long time. Is it always the case that the voltage across the capacitor = the voltage of the battery? Even though they're in parallel.
SSL2's user avatar
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2 answers
54 views

Why is current constant in a series circuit?

This is more of a confirmation I require rather than a direct question, please do guide though, since I can be terribly wrong. (I do not have much knowledge of this.) Current is defined as the ...
Confusedaf's user avatar
-1 votes
5 answers
101 views

Question about Voltage in circuits

What does for example "9V on a battery measure" really measure, is it the electrical potential of a single Coloumb of charge provided by the battery? Is it the potential difference? If it's ...
Saad's user avatar
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2 votes
1 answer
46 views

Questions about batteries and circuits

If the electrical potential difference is the difference in potential energy over charge Say we have a circuit, we plug it into a 1.5V battery, does that mean that for every coulomb of electrons ...
Saad's user avatar
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0 votes
2 answers
61 views

Capacitor discharging connected to power supply AND resistor together

Lets say I have 2 capacitors P and Q connected to a 9V supply. Across P there's a resistor connected in parallel with the switch open (off position). When I turn on the battery they both fully charge. ...
Safa yousif's user avatar
2 votes
3 answers
188 views

How the current actually flows in a circuit?

I'm studying about electricity and i'm quite lost. Given the circuit in the picture, I just want to know how the current flows through the points A, B, C, D. The condition to have current between 2 ...
InTheSearchForKnowledge's user avatar
1 vote
0 answers
22 views

Capacitor charging a battery [closed]

I can't comment to ask for circuit clarification on some of the other questions addressing this, insufficient reputation, so I am asking as a new question. Looking at answers to the other questions a ...
MadMaxx's user avatar
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0 votes
2 answers
55 views

Is there any current flow from a battery to the earth?

Suppose I connect the + (or -) pole of a battery to the earth with a conducting wire, will there be a current flow? As I understand, the Earth is considered to be "neutral" in the sense that ...
InTheSearchForKnowledge's user avatar
1 vote
0 answers
28 views

Resulting pressure of batteries in series [closed]

Hi everyone we are working on a battery project and have the following question. What is the influence of stacking battery cells next to each other in a battery module on the resulting pressure ...
Louis DV's user avatar
1 vote
1 answer
60 views

Capacity loss in a battery

It is often said how to the health of a battery gets worse as you charge and discharge it through numerous cycles. So, the maximum available cell capacity a battery can have after recharging reduces ...
risa's user avatar
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1 vote
3 answers
156 views

Does the circuit need a wire?

I watched a YouTube video of Derek from Veritasium in which at 13:20, he claims that the lightbulb will turn on even if the circuit is broken, which astonishes me. How can it be possible while when I ...
InTheSearchForKnowledge's user avatar
0 votes
1 answer
57 views

Electric car battery weight: understand question [closed]

Could you please assist an absolute beginner in understanding the core aspects of this problem and the relevant topics necessary for solving it, as well as specific of electric-car that should be used ...
renathy's user avatar
  • 153
1 vote
1 answer
174 views

Does resistance of a rheostat affect current in the circuit?

This is the typical experimental setup to determine the unknown resistance of a given wire. As we move the sliding contact of the rheostat, we get different values of voltage and current. a plot of V ...
Navya's user avatar
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0 votes
0 answers
35 views

Phenomenon causing Voltage in Batteries

I have a simple question: you can think of a charged particle as a particle with mass, and hence there will be an electric field surrounding the charge, which causes electric potential energy (if ...
V T Naveen Mugundh's user avatar
0 votes
1 answer
38 views

Derivative of formula for battery's output power is not right

There is something about output power of battery in circuits that bothering me. I hope you help me. So we know the formula for power in electrical circuits is (current x voltage) or: $$ P=IV $$ and ...
rebin's user avatar
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4 votes
3 answers
982 views

Is a battery always electrically neutral in the circuit? If so, why?

In this circuit, the sum of the charges on both the plates is 0.The sum of the charges present on the negative terminal and positive terminal of the battery is also 0 (I think). Is it possible for the ...
Pumpkin_Star's user avatar
1 vote
1 answer
87 views

Purpose of potential difference in the presence of an electric field

Based on my understanding, charges are pushed along wires due to an electric field created by the battery, and charges gain electric energy as they loop through the battery. But I can't seem to ...
AscenderVI's user avatar
0 votes
1 answer
43 views

Understanding voltage conservation by capacitive coupling

At work we faced the following problem: We are working with some high voltage batteries which are located inside a casing which isolates the batteries. This means you cannot get any significant ...
Niclas's user avatar
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3 votes
1 answer
267 views

Is power of a battery constant?

In my question I'm neglecting the impact of discharging. I'm trying to make sense of Watt's law: $$P=IV.$$ I always thought that the voltage and the power of a battery were constant features that ...
Роман Кирьянов's user avatar
0 votes
1 answer
81 views

I find two different answers using Kirchoff's rules on single loop [closed]

I found this question in a book asking for voltage $X$. I allowed them to use any method they want. I too after revision using kirchoff's loop rules am getting too different answers. Please help me to ...
KANYARWANDA Cyprien's user avatar
1 vote
1 answer
53 views

How does current work in this instance? [closed]

If current has two ways to flow in a single circuit, let’s say one path has a resistor of 5 Ohms and the other has no resistors whatsoever, will current still flow in both of the conductors? Can ...
airil luqman's user avatar
0 votes
0 answers
34 views

How can I simplify this electric circuit? [duplicate]

I am having trouble simplifying this electric circuit. Should I neglect R1 in the simplification or not?
Ahmed Amir's user avatar
2 votes
1 answer
134 views

How to deal with the current going opposite direction through battery [closed]

Say that the current source is doing whatever it needs to do to output $1$A and that the battery is a $3$V battery. For simplicity, say the resistor is $1\Omega$. I get that since we have $1$A ...
sam's user avatar
  • 33
0 votes
1 answer
58 views

Power delivered to a Resistor is $V^2/R$. Does size of battery matter?

I had connected a thin Resistor wire to series combination of six coin cells or to a small sized 9V battery. The wire got hot in a normal way BUT when I connected the same resistance wire to a large ...
Shinnaaan's user avatar
  • 1,357
-1 votes
1 answer
59 views

Voltage across a capacitor in a circuit [closed]

I'm trying to find the voltage across the capacitor when it is fully charged in the attached diagram, I haven't done a problem like this before and I'm quite confused on what I am supposed to do to ...
bob's user avatar
  • 1
0 votes
1 answer
69 views

Diode confusion

Consider the following diagram Here, the diode is in forward bias, and allows current to flow. However, I am slightly confused why this is the case. A diode is defined to only allow current to flow ...
Quin Gardiner Bax's user avatar

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