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

Dryness of materials, What are simple ways to quantify the dryness of a sem...

What are simple ways to quantify the dryness of a semi-permeable hard surface?

What is the basic difference between current and voltage, They are exactly ...

They are exactly analogous to water pressure and water flow by a hose. That's why flowing electrons is known as a current, just like a water current. Voltage is the electromotiv

How can we increase current sensitivity of a galvanometer, Q. How can we in...

Q. How can we increase the current sensitivity of a galvanometer? The current sensitivity of a galvanometer is able to be increased by (i) Rising the number of turns (ii

Experiment of laboratory tweezers, Laboratory tweezers Very serviceable...

Laboratory tweezers Very serviceable tweezers can be made from lengths of flexible strap iron used to place around boxes and creates for shipment. The tweezers shown are abo

Define persistence of hearing, The impression of sound heard by our ears pe...

The impression of sound heard by our ears persist in our mind for 1/10th of a second. If another sound is heard before 1/10 second is over, the impression of the two sound mixes up

Rainbow formation, how is Rainbow is formed in a Environment ?

how is Rainbow is formed in a Environment ?

Heat therapy - b-infrared (ir) radiant heat, B-Infrared (IR)  Radiant Heat...

B-Infrared (IR)  Radiant Heat Heat radiation can be achieved by using infrared (IR) radiation it penetrates about 3mm in the skin. excessive exposure can cause erythema(redden

An aquarium for larger water animals, An aquarium for larger water animals ...

An aquarium for larger water animals A glass aquarium 50 cm by 25 cm is of useful size. Old accumulator cells are suitable, but the glass is not very obvious.  To prepare l

Acsr (aluminium conductor steel reinforced), ACSR (Aluminium Conductor Stee...

ACSR (Aluminium Conductor Steel Reinforced): Owing to the low tensile strength of aluminium, aluminium conductors produce greater sag which prohibits their use for longer spans

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