Cell capacity, Physics

Assignment Help:

CELL CAPACITY

The amount of electrical energy that a cell can provide from new to the end of its useful voltage on load is called the cell capacity and is quoted in Ampere hours (A-h).

Capacity varies with the amount of current drawn from the cell, the greater the current the lower the capacity, therefore capacity is normally quoted at a standard rate. The 1hr rate is the internationally accepted standard for Nickel Cadmium cells, with 10 hr or 20 hr rates being used for Lead Acid cells.

A cell quoted at 40A h at the 10 hr rate will provide 4 Amps continuously for 10 hours.

A battery quoted at 40A h at the 1 hr rate will provide 40 Amps continuously for 1 hour.

A 40 A-h cell will only be able to provide a discharge current of 80 amps for approximately 20 minutes, not 30 minutes as may be expected by calculation. Similarly, it will be able to supply a discharge current of 20 amps for longer than the expected 2 hrs.

The capacity of a cell is also affected by its age, the older a cell, the lower its capacity, therefore the only way of determining actual capacity is to measure it.


Related Discussions:- Cell capacity

How is quantum theory conceptual view explained, How is quantum theory conc...

How is quantum theory conceptual view explained? Quantum theory gives us with the rules and regulations of the small world. The quantum theory conceptual foundation is mysterio

What is the cause of brownian motion, What is the cause of Brownian motion?...

What is the cause of Brownian motion? Molecules in a gas move constantly, freely, randomly, in all directions and at high speeds. They are able to do so because the intermolecu

What is rolling friction, The opposition offered to the circular motion of ...

The opposition offered to the circular motion of bodies like sphere, disc, ring, cylinder etc. on another surface is known as rolling friction.

What is centrifugal force, What is Centrifugal Force? Centrifugal force...

What is Centrifugal Force? Centrifugal force is the force that is equivalent in magnitude but opposite in direction to the centripetal force, which is the force directed toward

., what is radioactivity?

what is radioactivity?

Find the value of g by free fall method, initial position time the vibra...

initial position time the vibration mean time time period of the bob t time

Photodissociation, is there any way to photodissociate explosives or bullet...

is there any way to photodissociate explosives or bullet so that it can not fired

Estimate how much energy is transferred as heat , 2 moles of an ideal gas e...

2 moles of an ideal gas expand isothermally and reversibly  from 50.0 dm 3 to 97.8 dm 3 at a temperature of 63.7 o C. (i) Calculate the entropy change for this process,

What is the electric potential, S uppose you have two parallel, metal plate...

S uppose you have two parallel, metal plates that have an electric field between them of strength 3.0 x 10 4 N/C, and are 0.050 m apart. Consider a point, P, located 0.030 m fr

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd