0
What are the applications of comparing Emf of two cells with the help of potentiometer?
Wiki User
∙ 14y ago
I think you are talking about it's internal resistance or it's ability to supply a current to a load without significant drop in voltage.
Experiment to find EMF of unknown cell
The 1 Metre scaled potentiometer is placed across a cell of known EMF and the 'jockey' or slider connected to one terminal of a galvanometer. The second cell is wired with similar polarity to the first cell and connected from the other side of the galvo to the common negative terminal of the two cells.
The slider of the potentiometer is progressively moved up from zero until the galvo shows no current. The EMF of the unknown cell is now a direct proportion to the reading in cm read of the metre scale.
Example
If the known cell has EMF of 3 volts and the galvo balances at 50cm then the unknown cell has EMF of1.5Volts
Dry cells used in flashlights have a fairly high internal resistance whereas a Lead acid car cell has a very low internal resistance allowing the starter motor to draw hundreds of Amperes without volt drop.
Wiki User
∙ 14y ago
Comparing the EMF of two cells using a potentiometer can help determine the difference in voltage output between the two cells. This information is useful in determining the efficiency of the cells, identifying faulty cells, or selecting the cell with the higher EMF for a particular application. Additionally, it can be used in educational settings to demonstrate how potentiometers work to measure EMF variances.
Add your answer:
Earn +20 pts
What cells help you get oxygen?
Red Blood cells help you get oxygen to your cells
How does the electrochemical process help you?
The electrochemical process involves the conversion of chemical energy into electrical energy, making it useful for applications like batteries, fuel cells, and electrolysis. It provides a way to efficiently store and produce energy for various devices and systems.
Do white blood cells and antibiotics help fight disease?
Yes, they help.
Do plant cells help make the plants make food?
Yes, plant cells help make food through a process called photosynthesis. Chloroplasts within plant cells contain chlorophyll that captures sunlight, which is then used to convert carbon dioxide and water into glucose (sugar), providing the plant with energy.
What are cells use for?
Stem cells are used for fighting off deadly diseases, and stem cells can help cell growth and reproduction.
What is sensitivity of a potentiometer?
Sensitivity of potentiometer means~ smallest potential difference that can be measured with the help of it.
How does comparing yourself with others help you?
It doesn't
What cells help you get oxygen?
Red Blood cells help you get oxygen to your cells
How do cells help an organism?
help us with brain cells
Can a potentiometer detect angle?
Yes, but you need a circuit (a PLC may be of help) to convert the potentiometer output (say 0 V to Vmax) into angles. A conventional potentiometer (linear) powered by a constant voltage power supply will work for angles from 0 to 90 degrees, since the voltage you get will be proportional to the angle sinus, starting from zero up to Vmax @ 90 degrees. For angles from 0 to 180 degrees (or -90... 0... +90 degrees) it will be easier with two power supplies connected in series taking the middle point as zero (Volts). Positive voltages from the potentiometer cursor against zero will be obtained for positive angles and negative voltages for negative angles, but you might need a 360 degrees or multiturn potentiometer. There is the basic idea, the rest is yours...
What are the answers to the Comparing Athens and Sparta worksheet?
As we don't have the worksheet, we can't help.
What are some commonly used help desk applications?
There are a lot of different help desk applications out there. Mainly all of them seem to do the job. Some of the most popular help desk applications are ZenDesk, SysAid. It is good to do a search for yourself and try out the different applications. Most help desk programs have free trials so try out each one and see which application works best for you.
What is the calibration of ammeter?
An ammeter should not be used as a voltmeter. An ammeter is a low impedance device that measures the current going through a circuit, often by measuring the small voltage across a known resistance. A voltmeter is a high impedance device that measures the voltage across a circuit. If you were to connect an ammeter as if it were a voltmeter, you would effectively short out the circuit, drastically affecting its operation, and potentially damaging both the circuit and the ammeter.
Who offers the lowest priced discount cruises to the Bahamas?
www.cruisecheap.com can help you find the best deals. They help by comparing rates.
What are mesenchymal cells?
Mesenchymal cells are a type of stem cell that can differentiate into various cell types, such as bone cells, cartilage cells, and fat cells. They are found in the connective tissues of the body, like bone marrow and adipose tissue, and have the potential to help with tissue repair and regeneration. Mesenchymal stem cells are being researched for their potential therapeutic applications in regenerative medicine.
What cells help transfer sound?
Ganglion cells
Which method will best help you determine whether or not a secondary source's conclusion is valid?
Answer this question… Comparing the conclusion with several other sources
