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

Aameter, aameter - construction and working

aameter - construction and working

What current would be needed to produce the flux, a) A uniform mild steel r...

a) A uniform mild steel ring has a diameter of 50mm and a cross-sectional area of 1cm 2 . Determine the mmf essential to produce a flux of 50µWb in the ring. (b) I

#title, Ask questiA 1.10×10-2-kg bullet strikes a 0.300-kg block attached t...

Ask questiA 1.10×10-2-kg bullet strikes a 0.300-kg block attached to a fixed horizontal spring whose spring constant is 2100 N/m and sets it into oscillation with an amplitude of 1

Explain the term magnetic declination, Explain the terms (i) magnetic decli...

Explain the terms (i) magnetic declination and (ii) angle of dip at a given place.

Evaluate the lateral shift, A ray of light is incident on one of the faces ...

A ray of light is incident on one of the faces of a parallel sided glass slab at an angle of incidence 510 31' of thickness 0.12 m . Evaluate the lateral shift produced given refra

Amplfler, Ac equivalent circuit

Ac equivalent circuit

Rate, What is rate of an assignment question?

What is rate of an assignment question?

Magnitude of k.e. in an orbit, Magnitude of K.E. in an orbit is equal to: ...

Magnitude of K.E. in an orbit is equal to: (1)Half of the potential energy     (2)Twice of the potential energy       (3)One fourth of the potential energy   (4 ) None

Coulombs law, Coulomb's law (C. de Coulomb) The primary law for electr...

Coulomb's law (C. de Coulomb) The primary law for electrostatics is analogues to Newton's law of universal gravitation. This states that the force among two point charges is p

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