Cell Definition and 899 Threads

Homework Statement Explain why the PD between the terminals of a cell is not always the same as its EMF. A cell, a resistor and an ammeter of negligible resistance are connected in series and a current of 0.80 A is observed to flow when the resistor has a value of 2.00 Ω. When a resistor of...

In Material Science, what is a primitive cell when speaking crystals.

Hi all, I am trying to further my understanding of the Plasma-Electrode Pockel Cell, particularly used at the National Ignition facility. As I currently understand it, its used as an optical switch by rotating the polarization of light when it passes through a KDP crystal and plasma electrodes...

My understanding is that genes code for proteins that then do a certain function. Apart from mitosis in an organism, I heard that cells (in forms of stem cells) are also produced and released into the body. I guess these would be all the floating around the body cells? Or the nerve cells that...

The definitions of electromotive force of a cell that i have read include: 1.When no current is drawn from a cell,i.e., when the cell is in open circuit, then potential difference between the terminals of the cell is its electromotive force. 2.The electromotive force of a cell is defined as...

Dear All, I have a monoclinic cell with a=18.7,b=3.55,c=9.069 and beta=134 degrees, angle between a and c. Now I need to make the c axis parallel to z axis for surface calculations, ie to introduce a vacuum. What is the rotation matrix that would do this?? Thank you.

Homework Statement During electrolysis in the cell below, 1.05 g copper is deposited on electrode X. Which one of the following statements is correct? (Relative atomic masses Cu = 63, Ag = 108). A) The mass of silver electrode W decreases by 3.60 g.B) The mass of silver deposited on...

Homework Statement The diagram below shows an electrolysis cell which contains 1L of an aqueous 1M copper(II)sulfate solution. If 0.4 moles of electrons pass through the cell, the concentration of copper ions after passage of the charge will be A) 0.4 M B) 0.8 M C) 1.0 M D) 1.2M...

Hi, Jake here. I've created some graphics about solar cells that covers high level, general info and even delves into some atomic-level subjects. However, I'm no physicist and I'm sure it shows. If any of you could take a quick look at my work and review for errors, that would be awesome. My...

Hi everyone good day to all who will read this! We have a project about active cell balancing that will be put inside an electric-car. We are planning to use LTC3300-2 IC that can perform charge transfer. However, our question is that, How to choose the right microcontroller for our project...

This has been confusing me a lot lately. I built a type of battery derived from a solar cell that outputs a constant voltage of 0.5 Volts. My original plan was to work out a method to boost this voltage to around 1V to power a joule thief and light an LED using a capacitor charged by the cell...

Hello everybody, this is probably a very novice question, but imagine anode and cathode, both made from copper immersed in CuSO4 aqueous solution (1M at standard temp and pressure + assuming electrodes are very near each other -> minimizing diffusion/migration resistance) and: Cu(2+) + 2e- ->...

Homework Statement My teacher told me that the force will increase ##k^2## times, where ##k## is the dielectric constant, but I don't see how. Homework EquationsThe Attempt at a Solution To start with, with no dielectric, the force between the plates is given by ##\frac{q^2}{2A\epsilon_{0}}##...

I know illumination, bandgap of the material, temperature, quantum efficiency all have an effect on the current and voltage of a solar cell. But what about the doping, and the generation and concentration of charge carriers? A semiconductor can only generate a finite number of charge carriers...

What is the role of Quantum Mechanics and Thermodynamics in solar cell operation? Is quantum mechanics the photovolatic effect, and thermodynamics the cell efficiency?

Hello there ! I got question regarding PV cell. The current at maximum power Im calculated from current-voltage characteristic doesn't equal to the one calculated from P(Ushunt, as you can see in the attached picture. http://prnt.sc/b864hx Furthermore, the Im from P(U) characteristic is about...

What equipment is needed for illuminated I-V measurements of a solar cell? light source, 2 multimeters light source, 2 multimeters, variable resistor, voltage source light source of variable intensity, 2 multimeters, irradiance meter Light source, 2 multimeters, variable resistor PV analyser...

When irradiance increases what happens to open circuit voltage and short circuit current of a solar cell? Do they both increase linearly? Because temperature affects open circuit voltage, so I'd assume open circuit voltage doesn't increase linearly then...

For inorganic chemistry, I am being asked to draw the solid state structure of polonium which i know how to do. However it asks what the symmetry of the unit cell is, and I don't know how to answer. I know what a unit cell is, I'm just not sure what the question means, or what it is looking for...

What happens to current in a solar cell when temperature increases? I found two sources with different information. 1) As solar panel temperature increases, its output current increases exponentially while the voltage output is reduced linearly.' 2) Whereas, this second website says short...

Hello. I have been running several experiments on an electrolytic cell, and I am trying to determine if side products are being formed at higher voltages. My thinking is that once the initial potential barrier is broken, and the resistance stabilizes, a volt vs amperage graph should be linear...

Hey guys, I am building my own battery operated cell phone charger. I am pretty sure I built my circuit correctly because the outputs I am reading on my USB output port: pin 1 is 5V and on pin 4 is 0V... which are good readings (and tells me that my voltage regulator is functioning properly and...

It is said that nucleus is the largest organelle in the cell. (Well, it doesn't really specify.) So, I'm actually wondering about the vacuole. Isnt it drawn the largest in plant cell? I did manage to find some information from internet but I am not really satisfied. :3 No offence, just say what...

Hi, we set up a cheap laser pointer bouncing off a mirror that was hot-glued onto a balloon stretched over the end of a coffee can. The reflected light hit a cheap 3x5 solar cell that was plugged into a stereo's microphone jack. A person could speak into the can and their voice would be heard...

I'm trying to learn more about fuel cells, and a question came across my mind. Before I ask, I once read that a fuel cell is not the reversal of an electrolytic reaction, and vise versa. Can someone please elaborate in the following question? Anyway, If I had two containers, both enclosed...

Thought this was interesting. Wonder if it will be profitable enough to upscale. http://www.fastcoexist.com/1681562/solar-roads-charging-roads-and-the-future-of-transportation

During cell division there are different processes that take place like prophase,metaphase,anaphase etc...I don't understand about chromatin condensation and chromosomal condensation that happens during these processes.Can some one explain how the chromatin material changes itself in different...

1) My teacher said that to analyze the properties of entire crystalline solid, we just need to analyze the properties of a unit cell, which is the smallest repeating unit of a crystalline solid. 2) But crystalline solids are known to be anisotropic, i.e. they have different properties in...

I read somewhere that antibiotics can have no effect on Mycoplasma as they do not possesses a cell wall.But How ? Antibiotics should be able to get into the bacteria very easily when there is no cell wall,right ?

Hello everyone, Greetings of the day. My name is Zeshan, I am automation engineer, I am stuck in problem of automation of weighing and sort system in chicken slaughter house using plc and load cell. Everything is done right but load cell is not giving me the right weight to make the right...

I've come across a question which is asking what would happen in a cell with odd diploid number 2n=15 when it undergoes meiosis. Here's my thinking: - 15 chromosomes, so 7*2 homologues + 1 loner? - Hence, after Meiosis I, we'd have 7 chromosomes in one cell, and 8 in the other? - After meiosis...

This i know sounds like a really odd question, but thinking along the Lines that i am.. i guess it has a sense of validity. Could it be Possible, that Planets exist with Dual cores that internally orbit inside a Planet.. or partially joined. Thinking along the lines of Cell structure and how...

Hey guys, my group is building a tensile tester for testing 3d printed parts as specimen(standard ASTM D638). We're trying to use cheap parts to build the machine and I would like to ask you guys something about load cell. When choosing which load cells to buy, what conditions should I consider...

Hi I have a pretty specific question. It is in regards to tissues in multicellular organisms. Is there any information on how different cell grouping arose in multicellular organisms? I have some ideas from what I've so far read and learned: - Would this have happened because two different...

I watched many videos and read bunch of answers about this, but I was having a hard time finding an answer to this one point: What is the exact moment an organism realizes that it is under an attack? I understand that there might be a few different types of ways a body can react too. So far...

Homework Statement The electric potential difference across a neuron cell membrane is 0.070 V. The thickness of the membrane is 5.0 x 10-9 m. a) Find the magnitude of the electric field across the membrane. Describe any assumptions you are making. Homework Equations ε = V/r The Attempt at...

I would like to start experimenting with hydrogen as an electricity source, but I haven't been able to find any good resources for steps after the hydrogen generation. I've made some prototypes of small-scale hydrogen generation using electrolysis, so now I basically have two bags, one filled...

Homework Statement A voltaic cell is set up and a chemical reaction proceeds spontaneously. Which of the following will not occur in this reaction? (A) The electrons will migrate through the wire. (B) The cations in the salt bridge will migrate to the anode half cell. (C) The cathode will...

Homework Statement An electric circuit consists of 3 identical resistors of resistance R connected to a cell of emf E and negligible internal resistance. What is the magnitude of the current in the cell? (in the diagram two of the resistors are in parallel with each other then the other in...

How much current can be forced through a photovoltaic (solar) cell before its performance starts to deteriorate? In certain accelerated lifetime testing 1.25xIsc is forced through a solar module while it sits inside a chamber (no incident light). Is there a theoretical limit to the amount of...

Homework Statement Say we have a circuit where a cell with internal resistance r is connected to a voltmeter with extremely high resistance. This means practically all of the p.d would be across the voltmeter as the ratio of its resistance to the internal resistance is, say, infinitely high. So...

Homework Statement The E° value of one cell reaction is positive and that of another cell reaction is negative. Which cell reaction will proceed toward the formation of more products at equilibrium? *Problem 19.20, Chemistry: Chang, Raymond. 10th ed. Homework Equations E° cell = E° cathode -...

There are now more active cell phones than humans. (?) The camera lenses of cell phones can detect cosmic rays. An app has been created that stores such detections in a data base. The app has been used in Iceland, Uzbekistan, and Uganda. There is no apparent practical use, it is for...

I ran across a term called 'isothermal settling' where you have an exponential distribution of particles - with more at the bottom and fewer at the top and how it relates to the cellular environment. My question is to what degree does isothermal settling (and the overall effect of gravity)...

When a galvanic reaction reclaims its (single) electron, magnetic energy (about 0.356 eV) within a superconductor will remain, w/o a means of replacing the galvanic electron. During the reaction, electrical current from the single electron would correspond to the number of times per second...

Hello, Am having this confusion that in Boltzmann approach to Statistical Mechanics, the phase space was divided into small phase cells whose magnitude was of the order of (h^f) but Boltzmann also made the assumption that the smallest phase cell must contain a large number of atoms. Doesn't this...

1. Homework Statement Homework EquationsThe Attempt at a Solution

Ecell = E0cell - (RT/nF)lnQ So I understand the Nernst Equation, but I don't have some info. (Please bare with me, I'm in secondary) I'm doing a Cu - Al cell. My E cell is negative (-1.33). Does this have an affect on the equation? What exactly does E0 stand for? I understand how to find E...

We are applying a force with a machine that has a dial that measures lbs. P=F/A We have 5 blocks with a combined area of 20 in^2 and we want to apply a pressure of 35 PSI to them. Therefore F(total) for the entire Area is ~700 lbs. This is what the machine reads. If we put the load cell on...

In bacteria there's a capsule but I'm not sure what it is/does.