Cell capacity, Physics

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.

Posted Date: 9/13/2012 1:54:31 AM | Location : United States







Related Discussions:- Cell capacity, Assignment Help, Ask Question on Cell capacity, Get Answer, Expert's Help, Cell capacity Discussions

Write discussion on Cell capacity
Your posts are moderated
Related Questions
Derive second law of thermodynamics According the thermodynamics II Law,  *efficiency never be unity or never exceed unity.  *Coefficient of performance never be infinite

how can sensitivity curve b measured?

Assume a crane lifts a 900 kilogram wrecking ball 12 meters above a concrete slab.  105,840 Joules of potential energy are kept in the wrecking ball.  Now the ball is dropp

can i get assistance here with questions involving the design of a permanent magnet magnetic bearing?

Illustrates the formula of Rayleigh-jeans law? RAYLEIGH-JEANS LAW The energy distribution into the thermal spectrum is specified by given formula as follows: E λ = 8Πk


CENTRE OF GRAVITY: Consider a body as an accumulation of many small masses (molecules), all subject to gravitational attraction.  The total weight, which is a force , is

An express train, traveling at 36.0 m/s, is accidently sidetracked onto a local train track. The express engineer spots a local train exactly 100 m ahead of the same track and trav

Examples of like and unlike parallel forces?

Explain Tension Force (Ftens) : Force that is transmitted by a string, rope, cable or write when it is pulled tight by forces acting from opposite ends. The tension force is fix