# Questions tagged [batteries]

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

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1 vote
38 views

### How electrolytes conducts electricity?

While studying electrochemistry, I came across two key points that I'm unable to understand. why does DC alone break down the electrolytic liquid and b) Why doesn't AC do the same?
• 179
26 views

### Force on a test charge inside a cell

Considering test charge inside a cell. Let the cell be in an open circuit. I know that a potential difference will develop between the two electrodes of the cell. If I take a test charge and place it ...
1 vote
31 views

### How do batteries in parallel work? [closed]

So I understand that the voltage is the amount of work done per column of charge, so its sort of a "pushing force" and amp are just the charges per second, or "amount of stuff per ...
31 views

### THÉVENIN Equivalent of Circuit [closed]

I tried to convert the right generator of, current and resistance, to a generator of voltage in series with the resistances then adding the two resistances (both in series), then simplifying, but I ...
• 11
1 vote
13 views

### How do I find value of $I$ using Node Voltage analysis method? [closed]

How do I find value of current $I$, using Node Voltage analysis method ?
• 11
30 views

### How to derive Thevenin Voltage formula using Kirchoff laws?

Here's a simple voltage divider. I'm learning Thevenin Circuits now and we use the formula for Thevenin Voltage a lot (very useful!) but I'm not sure how the formula arises. My professor said I can ...
• 1
23 views

### What effects do inductors have on circuits?

The above diagram is a simple circuit containing an inductor. According to the right hand grip rule, it can be deduced that the magnetic field is to the right. But the magnetic field produced by the ...
• 308
29 views

### Why short circuit doesn't takes places in a homopolar motor?

In a homopolar motor we directly connect copper wire to a battery without any resistance with a magnet in bottom, so why doesn't a short circuit takes place?
1 vote
30 views

### If resistance in an electric current is 0 (ideally) then would there even be current flow?

From my understanding batteries are used to charge electrons with electric potential which they then use to do work on resistors in a circuit. After doing work the electrons return to the opposite ...
1 vote
115 views

### Circuit resembling wheatstone bridge but not exactly [closed]

The below circuit resembles that of two individual wheatstone bridge arrangements as the ratio of resistances satisfy the conditions however we cannot come to this conclusion as potential at one end ...
• 11
1 vote
48 views

### The current in an $LR$ circuit [closed]

I am trying to understand $LR$ circuits better. I am under the impression that inductors are resistant to change in current. So, the premise here is that the circuit was switched to side 1 for a long ...
• 13
19 views

### A question regarding determining internal resistance of a cell by using a potentiometer

In the given figure at null point J current does not flow through JD and AC but current does flow in the second circuit CDEF and primary circuit.My question is why doesn't current flow through ACFED ...
• 139
1k views

### Gravity train with the help of batteries?

Imagine a gravity train (https://www.math.purdue.edu/~eremenko/train.html) that goes through Earth's crust from point A to B. The train could advance through the ride just by the force of gravity and ...
• 898
23 views

### How can I safely heat up a AAA battery? [duplicate]

I’m working on a science experiment in whether or not the temperature of a battery affects how long it will last. It’s the middle of winter where I am and I’m not quite sure how to safely heat up the ...
30 views

### How is the work done by a battery (when connected to a capacitor) independent of time?

We know that W bybattery = V(It) = VQ, which is time-dependent. But when the battery is connected to a capacitor then W bybattery = 1/2 (CV^2), where C and V both are time-independent, hence W ...
24 views

### Why is the net charge between two adjacent plates of capacitors in series considered neutral? [closed]

The right-most plate of C1 connected to the left-most plate of C2 is said to be isolated from the circuit. How is the left-most plate considered positive and the right-most plate negative?
1 vote
32 views

### Reverse polarity of cells connected in series and net EMF [closed]

When 2 cells are connected in series with reverse polarity, the net emf of the combination is difference of individual emfs, but clearly this is not the case practically, since cells connected in ...
35 views

### KVL in short circuit with 0 resistance [duplicate]

According to KVL, $\sum \epsilon = \sum RI$ in any closed loop. However, in an ideal circuit with no resistance, R is $0$, and hence $\epsilon$ must also be $0$. Does KVL not apply in this case?
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