Questions tagged [batteries]

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

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1answer
83 views

Why doesn't the potential difference of a battery diminish when charge flows? [closed]

I want to know, when the charges travel from higher potential to lower potential of battery through the circuit then the potential difference must diminish. As it was previously made by keeping more ...
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3answers
177 views

Why the current doesn't flow in an open branch?

I know that the current will no flow towards the point A since there is no potential difference between A and the corresponding junction. However, between C and B, there is potential difference, so ...
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3answers
3k views

How is the electric field created by a battery inside a conducting wire constant?

My book says that a cell (or a battery) creates a constant electric field inside a conducting wire. They've made use of a cylindrical conductor for the purpose of explanation and said that since the ...
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2answers
143 views

Resistance of car battery

In my textbook, it is given that internal resistance of a car battery increases with decreasing temperature. But car batteries contain lead, which is a metal, and hence the resistance should decrease. ...
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2answers
33 views

New charge of a capacitor

How does the load of a charged capacitor vary when placing a dielectric between the plates while keeping the capacitor connected to the battery? If we have a capacitor that we have charged to the ...
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4answers
220 views

Inductor and Capacitor with a DC supply

Here is a LC circuit with a DC supply. When the switch is closed at t=0 capacitor behaves as a short circuit while the inductor behaves as an open circuit as the voltage across the inductor ...
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1answer
79 views

What happens when two identical real batteries are connected in parallel or in series?

I've been poking around looking for an answer for this, mostly because my intuitions have been wrong. What happens to the voltage and the resistance when 2 identical real batteries are connected in ...
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2answers
85 views

What is the cause of opposite electric current direction of flow of current inside a battery?

My question is that why the direction of current inside a battery is different than that of outside battery?Can someone explain how current is even carried inside a battery because free electrons aren'...
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1answer
31 views

Seperating Charges in a Cell

Sorry for not being detailed for my question here but how do charges seperate in a cell and when the electrons are pumped out of the battery does it return and become positive ? Yet again sorry if I ...
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2answers
2k views

Why does Li+ ion move to cathode in Li-ion battery?

When Li-ion battery is discharged or being used, the positive lithium (Li+) ions move from anode to cathode through the electrolyte. Meanwhile the electrons move in the same direction through the ...
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3answers
125 views

Power dissipated, different formulas, zero resitatance

Power dissipated on an electrical element can be given by: $$P = VI = I^2R = \frac{V^2}{R}.$$ When we have a battery with zero internal resistance, it means that the power it provides (or the power ...
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1answer
74 views

Why will connecting batteries in series only generate large current flow between the two batteries if one is less charged than the other?

If you connect an uncharged battery to a charged battery in series (+ to - and - to +) there will be a large current flow between the batteries and it will heat up as if it's being short circuited, ...
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1answer
80 views

Magnetic field enegy conservation [closed]

I will close the circuit with an inductor across a battery along with a resistor connected in series with battery and inductor, after reaching steady state I will break the circuit. then current in ...
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3answers
69 views

Case where potential difference causes no current

why current will not flow from battery if I connect positive terminal of battery to ground even when there is potential difference
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1answer
39 views

What happens when a non-rechargeable battery runs out?

In a simple DC circuit, a battery creates a potential difference by a chemical process. This potential difference exerts a force on the free electrons present in the conductor inducing a current. When ...
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4answers
7k views

Electrons moving in a simple circuit with a battery and a light bulb

I believe my understanding of electric currents is flawed and want some help to clear up a few things. I'm not looking for a precise scientific understanding, but to understand the basics. I'll try to ...
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2answers
48 views

Can electrons be contained to create a battery?

Just like gasoline is contained and used as needed can theoretically and erngeneer(ingly?), can electrons be contained and stored in its pure form? what I mean by pure form is not atached to atoms but ...
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1answer
263 views

How to measure the electrostatic field outside of a battery?

The eletric field of a battery should look roughly like that: Assuming $1,5\,\mathrm{V}$ voltage and a distance of $5\cdot 10^{-2}\,\mathrm{m}$, the mean electric field should be in the order of ...
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1answer
63 views

Why are batteries quite heavy?

The electrons that make up our electricity are very light; however, batteries have historically been very heavy. I was wondering what the physics reason is for this, and whether we can look forward to ...
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0answers
178 views

Estimating the battery capacity using current power consumption and battery percentage

I want to estimate the current maximum capacity (in kWh) having the current power consumption (in kWh) and the state of charge of the battery (in %) available in a time series. I do not have a full ...
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1answer
29 views

Does dropping a battery on the floor partially discharge it?

Can one mechanically discharge a battery? And if so, what is the mechanism responsible for that?
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2answers
74 views

How Can the Same Resistance Cause Different Voltage Drops?

Lets say we make two circuits, one a simple circuit connected to a 9 V battery with say a 9 $\Omega$ resistor attached,and one another simple circuit connected to a 9 V battery with a 9 $\Omega$ ...
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1answer
41 views

Impact of +ive terminal of the battery on the wire (Conductor)

My teacher told me that base line of electricity is the charge and charges have property of attraction and repulsion based on the polarity. Each charge has influence around it which is known as the ...
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2answers
99 views

A safe way to heat batteries

I'm working on a physics experiment where I have to investigate the effect of temperature on a battery's internal resistance. I know how to measure the internal resistance, but the problem is in ...
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1answer
174 views

Connecting two batteries in a circuit [closed]

I have 3 batteries, 2- 1.5 V batteries, and a 9V battery. I need 12V to run a DC motor connected on the circuit. Hoh should I connect the batteries? In series or in parallel?
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6answers
387 views

Why does the LED turn off if the high current is going through the short?

None of the other questions related to short circuits seems to answer my question. I understand how short circuits work theoretically, that if there is a path with no resistance in a circuit then all ...
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0answers
45 views

How to determine the best fit battery for a battery powered application? [closed]

This is an attempt to get some scientific information about how to best use batteries (I'm going to refer to both single cells or assemblies of cells as batteries for the sake of this question) in ...
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2answers
70 views

Does a battery actually provide electrons or are they the electrons in the wire moving due to potential difference?

When we connect a battery in an electric circuit, does it provide the electrons present at anode, or are they the electrons present in the wire?
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3answers
134 views

Ideal voltage source

Why is the internal resistance of the source zero in an ideal voltage source? Why does a practical voltage source have finite internal resistance?
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3answers
4k views

Why electrons flow through a wire connected to a battery?

I would like to know why does electrons flow through a wire connected to a battery as said in AC/DC: What's the Difference?.It tells that "the electrons that are stripped from the carbon electrode is ...
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5answers
9k views

How electron movement produces current,instead of having a slow drift speed

Just need a clarification here, how the current is produced due to the movement of electrons, in an external circuit,having a very slow drift speed. Normally in a battery there is high potential ...
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5answers
13k views

If we charge a capacitor can we discharge it into a battery?

I have read that we can charge a capacitor using a battery, but can the vice versa happen? My project needs to show a battery being charged through a fully charged capacitor.
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2answers
3k views

Why is voltage added when batteries are connected in series but not in parallel?

As I understand, the different voltage between two object is caused by the total different charged between two object. Thus, the higher extra electron between two opposite charged object, the higher ...
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1answer
740 views

Why is the electric field created by a battery non-conservative?

Electromotive force(emf) or $\mathcal{E}$ is defined as $$\mathcal{E} = \oint \frac{\vec{F}}{q} \cdot \mathrm{d}\vec{s}$$ Here, $\vec{F}$ is the force which pushes the charges through a conducting ...
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2answers
5k views

How many grams of explosive are equivalent to the energy in a battery?

In the movie Terminator 3: Rise of the Machines, Arnie's fuel cells were twice shown to be extremely devastating when their stored energy was released. In real life, how many grams of, say, gunpowder ...
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2answers
968 views

Why two separate batteries in a circuit don't work? [duplicate]

If electrons move from the negative side to the positive side in a battery(thus creating electricity when they flow), why doing the same circuit with two separate batteries doesn't create electricity? ...
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2answers
117 views

$E=mc^2$ tells us that everything has energy. So why can't we use anything as a battery/power source?

My body has mass, the floor has mass, the air has mass. According to the formula E=MC2, we can get insane amounts of energy with very very very small mass (looking at you antimatter). However our ...
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2answers
68 views

Bike light: what consumes more current, continuously on or blinking?

I've been riding my bike many nights wondering the following question: What consumes my LED bike-light battery: the continuously on setup or the blinking setup? It might seem trivial, since the ...
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4answers
16k views

Path of an electron through an electric circuit

When a potential difference is applied across a conductor, and if an electron moves from the negative terminal of the battery and reaches the positive terminal, then I want to know if the electron ...
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1answer
740 views

If a battery is open on one end but connected on the other, does it raise the potential on the connected end?

If a battery has one end open and other end connected to a circuit will the battery increase the potential at the point of connection?
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1answer
9k views

Relation between Terminal Voltage and EMF of a cell while the cell is being charged

I know the relation between the terminal voltage, V and emf of the cell, V' while charging given by V = V' + Ir where I = Current in the circuit and r = Internal Resistance of Cell Can anyone ...
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5answers
2k views

Can a capacitor be charged without having resistance in the circuit?

I was looking for the fact when a capacitor is directly connected to battery without resistor what will happen? If possible then tell the time for charging.
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1answer
95 views

What resistor should be connected to a $12\,\rm{V}$ battery for a $9\,\rm{V}$ output?

I have a $12\,\rm{V}$ car battery and a $9\,\rm{V}$ toy piano. I want to power the piano through the battery but the voltage is too high. What resistance should be connected to this circuit so that ...
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1answer
49 views

I need a 12V battery supply for a device can I just connect four 3V batteries? [closed]

its for a modem which requires a 12v adapter, 1amp. So I tried connecting 4 batteries and also 5 but it never turned on and I couldn't figure why?
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1answer
58 views

What's a reasonable difference in resistance between batteries in parallel?

I know that the differences in resistance between batteries in a circuit will create different drop, and as a result draw unequally. Unfortunately, I couldn't get my hands on a parallel D-cell ...
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3answers
1k views

Current flow with batteries in series vs parallel

Taking let's say three ideal and identical batteries, why does the current flow increase when we add them in series compared to them being in parallel? I can understand the height analogy for voltage ...
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2answers
3k views

Energy loss due to internal resistance of a battery?

Say I'm using a battery to power some process, and the internal resistance of the battery is given. The resistance of the process is not given, but assume it is minimal so the circuit runs at maximal ...
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1answer
124 views

Can a capacitor be charged with multiple batteries connected in series [closed]

I connect 2 9-volt batteries in series. Then I connect that to a capacitor. Will that then charge the capacitor to 18 volts?
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1answer
682 views

How does the voltage source provide energy in a circuit?

I understand that a voltage source drives the current to flow from the terminal with lower potential to the terminal with higher potential. However, if the electrons are gaining potential energy then ...
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2answers
78 views

Can an electric car be usefully powered (or at least supported) by solar energy?

There are cars on the road that run on electricity instead of gasoline. And that's great, it really is. But you have to charge them, which is a problem if there are no charging stations in your area....