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Questions tagged [batteries]

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

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1answer
78 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
68 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
37 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
47 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 ...
2
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1answer
212 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
175 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
27 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
69 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
89 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
157 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
353 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
64 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
126 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 ...
6
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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 ...
6
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1answer
690 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
836 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
114 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
67 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
715 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
8k 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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votes
1answer
48 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
57 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
112 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?
3
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1answer
643 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....
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5answers
288 views

Many cells in parallel

If two or more cells of unequal voltages are connected in parallel (with the same terminal on the same side), is there a formula that gives the net potential difference? Also, by Kirchoff's loop law, ...
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1answer
69 views

Why does all the voltage has to be dropped in a circuit?

In a simple circuit with a single resistor the entire voltage provided by the cell drops. It is independent of the resistance. Why does this happen? What is the mechanism behind this? I mean why does ...
3
votes
1answer
175 views

How the current moves in the battery and outside the battery?

Does it move again to the negative terminal or stays at the positive terminal until the electrons all come .so the voltage will.be zero and current flow .I want simple clear explanation because i am ...
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2answers
353 views

If two batteries that are fully charged with opposite polarities and one has higher emf.Does one will charge the other? [closed]

if there are two batteries fully charged in a circuit connected in series and one has higher emf than the other does one charge the other or not ? does any current pass in the circuit ?and if yes ...
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0answers
155 views

Quartz piezoelectric battery

I'm designing a battery that uses quartz crystals to hold/produce a current for a long time using piezoelectricity. My question is: Would it be more efficient to have multiple small quartz crystals ...
2
votes
1answer
149 views

What do the batteries actually do to the electrons?

I am plagued by this simple question that what force exactly causes the motion of an electron in the middle of a lattice of electrons of a wire? a. Is it an electric field created inside a wire due to ...
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1answer
1k views

Connecting cells in series and parallel

When 2 cells is connected in series of the same emf like the following: [just the part of the circuit that I need...] The resultant emf will be twice as the previous identical emf. If we reverse ...
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0answers
53 views

Is this Thevinin equivalent of a voltage divider, correct?

Found the PDF version of The Art of Electronics (Horowitz and Hill) recently, and, having nothing better to do... I thought I'd give it a read. It wasn't long before I hit a wall (courtesy: my inept ...
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1answer
391 views

Why does battery generate less terminal voltage difference when current flows?

The terminal voltage difference of a battery means the difference of voltage between the two termials of a battery. Now, a battery has a voltage at the positive terminal and a voltage at the negative ...
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3answers
1k views

Backwards proof for balanced Wheatstone bridge

We know that in this Wheatstone bridge if, $\bf{I_3 = 0}$, it can be derived that $\bf{\frac{R_1}{R_5}=\frac{R_2}{R_4}}$ . But could we prove it backwards, mathematicaly, that - if in such a circuit $...
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1answer
1k views

EMF of an ideal cell

I know it's a very stupid question but I am confused a little bit right now. An ideal cell has constant EMF of 7V. When connected in a circuit, the voltage across the cell decreases to 5V. Can i say ...
2
votes
1answer
286 views

Battery life with hot and cold wires

If a AA battery was kept at a constant temperature and was connected in a simple circuit will the battery drain faster if the wires are kept at a cold temperature or at a hot temperature? I ...