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

.heart, name 3 things that will change how many times your heartbeats per d...

name 3 things that will change how many times your heartbeats per day..

How many types does heat transfer, How many types does heat transfer? ...

How many types does heat transfer? There are three ways of heat tranfer. a) Conduction (transfer of heat among objects in direct contact) b) Convection (transfer of he

Person travels faster than light in a space shuttle, What happens if a pers...

What happens if a person travels faster than light in a space shuttle?  Ans) Interstellar space travel is manned or unmanned travel among stars. The concept of interstellar trav

Explain new terms for describing motion, Explain New Terms for Describing M...

Explain New Terms for Describing Motion As mentioned in the last chapter, the mass of a cannonball is a measure of the amount of matter (in kilograms) that would balance agains

Absorption and emission of A-B coefficients of einstein, Explain the absorp...

Explain the absorption and emission transitions of A and B coefficients of Einstein. Assume that N 1 and N 2 be the number of atoms per unit volume along with energy E 1 and

Fibre optics, Fibre optics: Light travels in straight lines, even thoug...

Fibre optics: Light travels in straight lines, even though lenses and mirrors can deflect it, light still travels in a straight line between optical devices. This is fine for

Why is the mass of a nucleus less than masses of neutron, Why is the mass o...

Why is the mass of a nucleus always less than the sum of the masses of its constituents, neutrons and protons? If the total number of neutrons and protons in a nuclear reaction

Straingth of material, the steel end-cap is fitted into grooves cut in the ...

the steel end-cap is fitted into grooves cut in the timber post.the working stresses for the post are 1.8 mpa in shear parallel to the grain and 5.5 mpa in bearing perpendicular to

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