Questions tagged [batteries]

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

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13 views

Can a combination of sliding capacitor plates create a long lasting current?

Can a combination of sliding capacitor plates create a long lasting current? Let say we can move easely the two negative plates from and towards the positive plate so when one is closer the other is ...
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State of Health of Lithium Ion Battery

The formula to predict the state of health of a battery is $$\text{state of health} = \frac{C_i}{C_0}$$ where $C_i$ is its capacity after $i$ cycles and $C_0$ is its initial capacity. My initial ...
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Lithium Ion Battery Remaining Life Cycle Prediction [closed]

What are the parameters required for remaining useful life predictions? For example, battery temperature and battery capacity values are helpful for remaining useful life cycle prediction. Other than ...
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1answer
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Maximum Voltage using two capacitors and a battery [closed]

What maximum potential difference can you obtain with the help of a battery of voltage $V$ and two capacitors of capacitances $C_1$ and $C_2$? ($C_2>C_1$) The answer given is $2V(C_1+3C_2)/(C_1+C_2)...
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In a resistor capacitor circuit, when capacitor is discharging, do the free electrons in the conducting wires or resistor move?

In normal battery resistor circuits, battery doesn't store any charge, its basically the free electrons of resistors /conducting wire that moves in a circuit. But in discharging of capacitor, charge ...
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1answer
45 views

Is this a correct way to think about 2 batteries connected in series?

Ok in this thread I asked about the potential difference between two separate batteries. My thought was, that if a voltage of a battery is all about potential difference between the two terminals, ...
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7answers
277 views

Why do we treat the whole capacitor as if it would be a single conductor?

I am a high school and I am very confused about redistribution of charges when we connect 2 capacitors, my problems are: why are we treating the whole capacitor as if it would be a single conductor ...
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1answer
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Is there voltage across the negative terminals of 2 batteries?

I understand that voltage is all about potential difference between two points, and that we can't really determine an "absolute voltage" of any point, only with respect to some arbitrarily ...
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2answers
25 views

How does a battery bring conductors out of electrostatic condition?

What does a battery exactly do to the conductors (eg metals)? How does it develop a field inside a conductor? On applying external field to the conductors (* I think that there will be a potential ...
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2answers
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Is battery a capacitor that's being continuously charged?

Is it correct to say that a battery is like a capacitor which keeps being charged?
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5answers
238 views

If I touch the “+” side of a high voltage battery, will I get shocked?

Voltage is electrical potential difference between two points. When these two points are connected using a conducting material, current flows. So far so good? Let's think of a high voltage battery (I ...
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Quick question regarding the meaning of Voltage of a Battery

Is the voltage of a battery simply the work necessary to move a unit charge from one extreme of the battery to the other? If this is the case, then when calculating the voltage of a battery the ...
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3answers
91 views

What is the connection between electric field and a battery?

Ok I'll start my question with laying some background: (Correct me if I'm getting things wrong - but don't be picky). Put electro-magnetism aside for this discussion - an electric field is some space ...
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1answer
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Which lamp(s) will glow? [closed]

I thought it would be through lamp 1 and 3 because the electrons can go through the circuit between lamp 2 and 3, then through lamp 3 then through the circuit between 2 and 3 again and finally down to ...
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1answer
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Potentiometer related question [closed]

Sorry, I am posting a assignment question but I found no other option. Figure shows a potentiometer circuit for comparison of two resistances. The balance point with a standard resistor R=10.0Ω is ...
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3answers
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How does grounding work?

This is a simple circuit that has been grounded. My question is, after reaching point $A$ will the current $I$ reach the negative terminal of the battery or will it go to the earth?
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What does a battery produce? Is it Electric Potential Difference (EPD) or Electro Motive Force (EMF)?

I have read a lot of posts about Electro Motive Force, Electric Potential Difference and their differences, but I still confused. What I know is that EMF produces a EPD and keeps it constant, then ...
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3answers
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Why doesn't current flow through an open branch?

I know that current doesn't flow through open branch because current can't flow through air due to its high resistance .But i was thinking , what's the problem if current flows through an open wire (...
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2answers
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Why does the potential across the terminals of battery increase on moving from negative terminal to positive terminal?

I really want to know that how does battery create a potential difference across the circuit. When we cross the battery from its negative terminal to positive terminal the potential rises by the ...
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2answers
33 views

Is the work done in carrying a positive charge in a circuit back to the original place $=0$

Is the work done in carrying a positive charge in a circuit back to the original place $=0$ ? my intuition says so, after all electromagnetic forces are conservative and the work done done against a ...
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12answers
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Why doesn't the voltage increase when batteries are connected in parallel?

Can you please explain the thing below? When we add a battery in circuit then, it gives out some electric field that moves through the circuit and gives a force on electrons in conductor to produce ...
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1answer
49 views

Is power delivered( or work done) by battery completely converted into heat?

I am currently a $9^{th}$ grade student. I recently learned about power delivered by batteries and also the heating effect of current.Consider a circuit consisting of a battery of e.m.f $E$ and a ...
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1answer
64 views

Why current in this circuit is zero? [closed]

My attempt:As the galvanometer shows zero current and the portion encircled contains no such device which can store charge therefore current entered must be zero as well. Moving on these lines I can ...
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2answers
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How people measured value of resistance of a conductor and EMF of a battery?

When I search on google""how to measure emf of battery "" the answer is to take a conductor of resistance R and multiply it by the current flowing through it!..then I search &...
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1answer
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Problem to find the Thévenin resistance [closed]

I need to find the Thévenin resistance and FEM of this circuit: I am a little confused why my answer is wrong. I mean, we could just calculate the resistance equivalent and go on with the ...
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1answer
32 views

Can a conductor act as a battery?

If a conductor is kept in an external electric field then it develops charge separation and counters the external field. If we connect its opposite ends using a wire and a load then can it act as a ...
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58 views

Charging capacitor, with series and parallel resisters

I understand how equations for charging capacitor are derived and what they represent. But here is my problem: if you want to experimentally see how voltage on capacitor changes with time, you have to ...
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2answers
79 views

On solving an RC circuit [closed]

Given the following RC circuit: it's required to calculate how the electric current varies and how the other electrical quantities vary. Based on that request, I was wondering if it was correct to ...
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1answer
92 views

What would happen if we remove the battery from a DC motor?

The construction of a DC motor and an AC generator is nearly the same, the only difference is that a dc motor has battery while the ac generator doesn't have the battery. If we remove the battery, won'...
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1answer
47 views

How are charges distributed on a capacitor in the following circuit?

Four metallic plates are used to form two identical capacitors as shown in the figure. Initially the plates were uncharged. Two batteries of different emf are connected as shown. We have to find the ...
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1answer
49 views

Graph profile of the voltage drop vs resistance across a resistor, and the physics behind electric potential difference

I am a student and I have been trying to understand the relationship between voltage drop and resistance, and the underlying physics of Kirchhoff’s voltage law. I am aware of Ohm’s law and I can ...
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1answer
40 views

How to calculate the voltage across a resistor using assumed states method? [closed]

The diode in the next figure is considered ideal (i.e. works as a simple switch, being turned ON when $U_D \geq 0$ and OFF when $U_D < 0$). What is the voltage $U_S$ across $R_S$? I've assumed ...
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1answer
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Query in circuits

Consider a 20 Ω resistor which is connected to a 10 V battery, the work done by the battery would be equal to the Voltage X Charge (W=VQ) so each coloumb of charge would have 20 J of energy, now when &...
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Which circuits are in Parallel and which are in series? [closed]

I need to figure out the equivalent resistance of the circuit, but I'm unsure as to how I determine which parts of the circuit are in parallel and which are in series.
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How to know which closed loop is valid to take when calculating current using Kirchhoff's 2nd law?

Using Kirchhoff's 2nd law, taking closed loop $\underline{A}BD\underline{A}$, $$2i_1-3i_2+i_3=0 .....(i)$$ Taking closed loop $\underline{D}BC\underline{D}$, $$-6i_1+10i_2+17i_3=0 .....(ii)$$ ...
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2answers
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Connecting DC supply directly to a pure inductor

There are some controversy on the internet as far as I see about connecting DC supply directly to a pure inductor (no resistance at all in the circuit). I mean, the voltage across the inductor will ...
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What happens to a charged capacitor when it is connected to a battery?

For example, if only one plate of the capacitor (capacitance $C$) is given a charge $4Q$ and it's connected to a battery of emf 4Q/C. Now, what will happen to the capacitor exactly? Will the other ...
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3answers
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Charging a battery or a capacitor, what does it mean?

What do you mean when you say to charge a battery or a capacitor or whatever it is that people charge? What are you doing? I was taught by some experts what charges are. There seem to be two types, ...
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1answer
58 views

How much vertical weight/height do I need to store 33 kWh of energy? [closed]

My question is the feasibility of a vertical mechanical weight battery, but unlike previous questions, I wanted to give a precise scenario and see if my math is right (which I doubt) First, it takes 1....
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Does terminal voltage change when adding a resistor in series?

I was under the impression that the potential difference from the source of a circuit does not change when you add a resistor, either series or parallel. However, my textbook says otherwise based on a ...
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1answer
39 views

Grounding a simple circuit?

Suppose I have a simple DC circuit consisting of a battery of voltage $V$ (no internal resistance assumed), and a resistor (resistance $R$) connected in series by conducting wires. Because the wires ...
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3answers
945 views

Proof of internal resistance acting like it does

I believe Ohm's law via the drude model (about average collisions time). Right after, I read about internal resistance of a battery, and they used Ohm's law as a justification. That doesn't make sense ...
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Would charging a capacitor with linearly increasing voltage lead to no energy loss? (no wire or internal battery resistance)

Assuming that the voltage increases linearly until the capacitor charges up and then stays at its max. Would there be any energy loss as happens when charging a capacitor with a constant voltage? My ...
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1answer
27 views

How exactly the dynamics of electrons flow works in a circuit with a single capacitor?

Does the difference in potential moves electrons from one plate to the battery higher potential side and simultaneosly moves electrons from the battery lower potential side to the other plate? And how ...
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1answer
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How can the current pass through the battery so the current flow continue if the e-field along the wire is opposite to the e-field inside the battery?

How can current flow continue and pass through the battery, if the electric field inside battery is in the opposite direction than the one inside the wire. Let us assume positive charges and ...
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1answer
70 views

Voltage of capacitors after long time ($RC$ Circuit) [closed]

I'm currently taking a course in electromagnetism, and I got stuck with this problem: The Problem: All of the resistors and capacitors have the same values, $R$ and $C$ respectively. The circuit is ...
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Drainage Effects on Series of Batteries with some Reversed

Lets say you have three batteries. Each are 1.5V, put in series with the others, but one is reversed. ---[- +][- +][+ -]--- The total voltage is 1.5V How does the orientation of those batteries ...
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Why the electric field inside the battery (when connected to a circuit) opposes the electric field into the wire?

I mean yea, ok, it makes sense inside the battery to point from + to -, but what the physical meaning of being opposite to the current flow (or the E-field inside the wire) is? For the sake of ...
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Why are these resistors not in series? [closed]

this is the circuit in question. I treated $R_1$ and $R_2$ as resistors in series, and $R_3$ and $R_4$ as resistors in series. Then the equivalent resistors were combined in parallel. However, this is ...

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