Questions tagged [batteries]

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

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40 views

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

What is the current supplied from the battery?
40 views

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 ...
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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 ...
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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 ...
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 ...
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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 ...
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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 ...
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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 ...
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54 views

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 ...
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 ...
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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 ...
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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 ...
49 views

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 ...
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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 ...
1 vote
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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 ...
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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.
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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 ...
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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 ...
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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 ...
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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. ...
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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 ...
1 vote
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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 ...
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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 ...
1 vote
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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 ...
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1 vote
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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 ...
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1 vote
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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 ...
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 ...
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1 vote
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 ...
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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 ...
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 ...
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 ...
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1 vote
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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 ...
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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 ...
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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 ...
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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 ...
1 vote
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 ...
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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?
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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 ...
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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 ...
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