Questions tagged [batteries]

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

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Can anyone help me with this physics question? [closed]

Hello i would like help with this physics question, I cannot solve it if anyone could possibly help me solve and understand the question that would be much appreciated.
Good Fam's user avatar
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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 ...
V T Naveen Mugundh's user avatar
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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
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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
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1 answer
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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 ...
AscenderVI's user avatar
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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 ...
Niclas's user avatar
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1 answer
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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 ...
Роман Кирьянов's user avatar
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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 ...
KANYARWANDA Cyprien's user avatar
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1 answer
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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
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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?
Ahmed Amir's user avatar
1 vote
1 answer
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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 ...
Shinnaaan's user avatar
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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
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1 answer
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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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1 answer
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Determining if a capacitor will charge or discharge based on voltage [closed]

The question also says that the voltage of the battery is 12 V. We're supposed to determine if the capacitor is charging or discharging or neither. I'm just not sure how to use the voltages given to ...
starry41's user avatar
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3 answers
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Weird Potential Divider Diagram

How does the above circuit work? My textbook only has potential divider circuits such that there is only one output voltage. Such as this one. Could we replace the arrowed line in the uppermost ...
Quin Gardiner Bax's user avatar
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2 answers
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Potential Divider Circuits

Consider the following circuit: From my understanding, consider the series circuit without the $V_o$ part. The voltage must be used between resistors $R_1$and $R_2$. We know $V=IR$ from ohms law. As ...
Quin Gardiner Bax's user avatar
1 vote
2 answers
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When a circuit with three lights goes from series to combination, with one on the main loop and two on different branches, does power in branches $↓$? [closed]

I am considering a circuit with three light bulbs. When a series circuit goes to a series-parallel circuit with one light on the main loop and two on different branches, the total resistance decreases ...
Nathan's user avatar
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How to know if resistors are in series? [closed]

According to Fundamentals of Electric Circuits, 6th edition, Alexander & Sadiku, p. 36 Elements are in series when they are chain-connected or connected sequentially, end to end. For example, two ...
tryingtobeastoic's user avatar
2 votes
1 answer
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Multiple batteries in a capacitive closed circuit [closed]

In the photo I added,there is a question as you can see and its given solution. When the switch S was open, charge on each capacitor was calculated and the voltage was taken as the net voltage of the ...
Saqib Rashid's user avatar
1 vote
1 answer
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Mismatching Batteries of Different Voltages

Consider connecting two batteries of different voltages $x$ and $y$ in parallel. Considering a series circuit, the total voltage would be $x+y$. However what happens in this parallel case? From my ...
Quin Gardiner Bax's user avatar
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1 answer
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Do chargeable batteries break the third law of newton? [closed]

When you charge a lithium battery for instance the electron momentum that coming out of the source is stored in the battery. The problem is that the direction of the electron might change when ...
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Capacitance and the battery connection

In the photo I added there is a question and its solution (given). It has been written at last(as I highlighted) that 'in order to get the minimum capacitance, dielectric should be removed and battery ...
Saqib Rashid's user avatar
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1 answer
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What is "capacitive effect" in terms of battery research?

For example, the paper I am reading states that the current was "periodically interrupted without changing polarity" to "demonstrate that the peaking behavior is not due to a capacitive ...
Alexis_Rose's user avatar
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2 answers
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How do the nodes affect the circuit?

I am tasked to simplify this circuit to one source and one resistor, which is equivalent to the original but obviously easier to solve. My problem is the fact, that I don't know how the nodes A and B ...
JohnnyB's user avatar
9 votes
3 answers
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How could one measure the capacity of a battery with one instantaneous meter reading?

My car battery when fully charged operated the car lights and air conditioning for a few minutes (without the engine being on) before it was not powerful enough to operate the starter motor. The ...
Avrohom Yitzchok's user avatar
3 votes
1 answer
112 views

Is there a theoretical limit on the charging speed of a lithium ion battery? [closed]

I'm wondering about lithium batteries in electric cars. Could time and technology improvements continue to improve charging speed, to the point where you could "refill" an electric car as ...
Rob N's user avatar
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How to calculate the total resistance? [closed]

So I am new to physics and I am trying to solve the total resistance of this circuit. My question is: because there is a battery in the same branch as R2 and a Capacitor in the same branch as R3, when ...
Oyster Blade's user avatar
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1 answer
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Simple $RC$ circuits

I have a $RC$ circuit with a capacitor (capacitance$=C$) uncharged initially and resistor (resistance$=R$) in series with the battery of EMF $E$. Assume its internal resistance to be negligible. Now ...
Ganesha Dattatraya Gaonkar CFA's user avatar
1 vote
1 answer
95 views

Why do my Milwaukee batteries weigh different amounts when charged vs uncharged

We use m12 small sized Milwaukee battery’s and I noticed when I use them I feel like they weigh different when using them sometimes while using them and then I read a article about batteries loosing ...
Kelton Clay's user avatar
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Is anode to cathode ion movement due to binding energy and electrostatic field?

I'm trying to understand exactly what chemical and physical effects oxidise the Li atoms and make Li$^+$ ions move from anode to cathode on discharge, and to find numbers in terms of electrode ...
JWT239's user avatar
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Why is the emf of the battery which is being charged included for the current flow?

When a battery is being charged, let's say it has an emf $\mathcal{E}$ and internal resistance $r$. At first it's completely drained, and we use a battery to charge it back, and lets say the emf of ...
Razz's user avatar
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2 answers
459 views

Gravity battery output calculation [closed]

Let’s assume I lift a 1 ton weight to 20feet high. To calculate the amount of potential energy stored in a 1-ton weight (2000 pounds) lifted to a height of 20 feet, Potential Energy (PE) = mass × ...
Shanthakumar's user avatar
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2 answers
107 views

Is there really no Cranking Amps formula?

I am looking for an apparently non existent physics formula (see below) so that I can very roughly (+/- 25%) calculate the Cranking amps (CA) of a SLA (sealed lead acid) battery. I want to use the ...
A Anderson's user avatar
1 vote
2 answers
86 views

Why does changing redrawing this circuit in the new way work?

I was doing a circuits question and the mark scheme showed they had redrawn the circuit in a new way but I didn’t understand why part of the old circuit was equivalent to the new one. I understand ...
Anis Manuchehri-Ramirez's user avatar
1 vote
2 answers
362 views

Potential difference across the terminals of a battery with internal resistance

The potential difference across the terminals of a battery with resistance is equal to the emf when there is no current.But when there is a current there the potential difference decreases or ...
Niladri Sarkar's user avatar
1 vote
1 answer
67 views

Why wouldn't current flow if a circuit is connected between batteries but the other ends of the batteries are disconnected?

This light bulb is connected between positive and negative terminals, but no current flows. Why does this not work?
zelkovaray's user avatar
1 vote
3 answers
89 views

Confusion regarding voltage drop in circuits

In electrostatics we were taught that Voltage drop is the work done by an electric field in bringing a unit charge from point A to point B. Or $V= E.d$ where $d$ is the displacement between A and B. ...
Pumpkin_Star's user avatar
0 votes
2 answers
120 views

Why do we get a null point in potentiometer or meter bridge?

Why do we get a null point in potentiometer or meter bridge. I mean the battery is connected so current should keep flowing through the circuit. So why do we get a point where no current is flowing as ...
Purvansh Sharma's user avatar
1 vote
0 answers
42 views

Why does my microwave turn on other battery powered electronics?

Situation: I have a 8-10 yr old LG microwave in a small alcove built into the cabinetry of our kitchen counter. I have a pretty cheap Bomata battery powered coffee scale that I store on the countertop ...
Gronk's user avatar
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Current flow trough capacitors at $t=0$ [closed]

I'm bit confused about the current flow in capacitors. My question is, let's assume those two electric circuits: As shown in the picture, the only difference is only the capacitance. I'm wondering ...
MrKnowOne's user avatar
0 votes
1 answer
108 views

Why do I measure 0 V between the negative pole of a battery and the ground?

I today confused the entire company (we work on batteries for trains) when I stumbeled about the following fact: When you touch the negative pole of a battery having electromagnetically isolated shoes,...
Niclas's user avatar
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5 votes
2 answers
1k views

Does the EMF of a battery change with time?

OK, so... I know that batteries provide less and less energy with time. My question is- is that a result of a decrease in the EMF of a cell or an increase in the internal resistance of the cell or ...
Maddy's user avatar
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2 votes
0 answers
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In a simple DC circuit does the surface charges on the wires influence the field of capacitor?

we know that in a simple circuit (a battery and a resistor) the battery induces surface charges on the surface of the wire such that the net electric field due to battery+surface charges inside the ...
Vivek 's user avatar
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3 votes
0 answers
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Black Hole Battery [duplicate]

What is the maximum charge/discharge efficiency of a spinning black hole when used as a battery via frame dragging effects? Charging: I'm pretty sure the best way to add to its angular momentum (in ...
Dustin Soodak's user avatar
2 votes
1 answer
299 views

How do electrons from a battery move through a circuit? [duplicate]

I'm reading a book called Practical Electronics for Inventors and it describes the method by which batteries generate electron flow as follows: the battery releases a few electrons via a chemical ...
Ahmed Malik's user avatar
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1 answer
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Why is charge surface uniform while circuit is open?

The above image shows surface charge distribution for open circuit(ends not connected). I point out different regions by numbers. The surface charge distribution is mostly uniform(maybe, not near the ...
Giorgi's user avatar
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1 answer
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Understanding section on electromotive force in Purcell and Morin's Electricity and Magnetism

I am following the book Electricity and Magnetism by Purcell and Morin. There is a section on the electromotive force that I would like to understand better. I will write out the snippets from the ...
xoux's user avatar
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4 votes
3 answers
299 views

How does battery make charge in conductor move?

A wire with resistance is connected to the two ends of a battery, how does the battery cause the free charges in conductor, the wire, move? I know the battery provide a potential difference. But how ...
Xiang Li's user avatar
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8 votes
4 answers
2k views

Why does voltage increase in a series circuit?

I'm just starting electronics and I find myself not understanding voltage at all. In a simple circuit, let's say a 1.5V battery connected end to end it's easy to see how there's a 1.5V drop. However ...
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