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

Calculate power required to operate the fan, A centrifugal fan is used to p...

A centrifugal fan is used to pump air. The fan rotor is 1 ft in diameter, and the blade spacing is 2 in. The air enters with no angular momentum and exits radially with respect to

ULTRA SONICS, WHAT IS THE FREQUENCY OF ULTRA SONICS

WHAT IS THE FREQUENCY OF ULTRA SONICS

Michealson interferometer, describe the principle, construction and working...

describe the principle, construction and working of Michelson Interferometer.

What is the kinetic energy of the block subsequent, A block of mass m on a ...

A block of mass m on a plane horizontal frictionless surface is pushed up against the end of a horizontal spring the other end of which is connected to a wall therefore that it com

Constraint relation : wedge and block, A block goes on a wedge which in tu...

A block goes on a wedge which in turns goes on a horizontal table, as given in figure. The wedge angle is Φ. As long as the wedge is in met with table, we have the trivial const

Poynting vector, determine the magnitude of Poynting vector end the energy ...

determine the magnitude of Poynting vector end the energy per unit time delivered to a wire of length land cross section A when electric current I flow in it

Explain the meaning of diffraction, Explain the meaning of Diffraction ...

Explain the meaning of Diffraction The spreading of a wave around a corner or through a slit of width b, which is about an order of magnitude of the size of the wavelength, is

A capacitor is able to serve as which of the following, Questions: A ca...

Questions: A capacitor is able to serve as which of the following? Answer: By classification a capacitor is a charge storage device. In storing charge a capacitor as we

Explain the procedure of finding miller indices, Explain the procedure of f...

Explain the procedure of finding Miller indices. Procedure of finding Miller indices: a. The intercepts of the needed plane onto the three coordinate axes has to be founded.

Determine the power input of ac motor, A 415V 3-phase a.c. motor has a powe...

A 415V 3-phase a.c. motor has a power output of 12.75kW and operates at a power factor of 0.77 lagging and with an ef?ciency of 85%. If the motor is delta-connected, verify

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