Top Capacity

Top Capacity

Battery Capacity, The Higher The Better?

Different models (in particular, different sizes) of the laptop battery, the higher capacity, the  longer working time. aside of volume and weight  factors , of course, the higher capacity the better.
But the same cell type, nominal capacity (for example, 600mAh) are the same, the actual measurement of the initial capacity different: for example one for 660mAh, the other is 605mAh, is the 660mAh one is better than 605mAh one?

Actual capacity may be high because the electrode materials to increase the initial capacity of more things, and less stable with the electrode things, the result is reused dozens of times after the rapid capacity of high capacity battery failure, the capacity Low battery is still strong. Many domestic batteries manufacturers often use this method to obtain high-capacity battery. The standby time users after six months it is worse than nothing. Civil those AA Ni-MH battery (that is, on the 5th battery), the general is 1400mAh, it also has standard high capacity (1600mAh), reason is the same.

 improve the capacity cost is the expense of cycle life, battery materials, manufacturers are not modified up and down the article, is not really "improve" the battery capacity.

How to avoid and solve that the battery can not discharge?

1. Reason:
a. The battery life decay after storage and using, ;
b. charge or charge less;
c. ambient temperature is too low;
d. discharge less efficient, such as the large current discharge proliferation of normal cells are not keeping pace due to internal material reaction speed, causing a sharp drop in voltage electricity can not be released;
e. has been to protect over discharge.

2. Measures:
a. the battery during storage is required to conduct a monthly charge and discharge;
b. The battery need to be recharger after Long-term is not used;
c. used in a normal environment;
d. proper use of the battery in the adapter of the machine.

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Calculate the increase in Temperature of water falling from the top of Niagara Falls to the bottom?

The physicist Joule suggested that H2O at the bottom of Niagara Falls, 50m high, should be warmer than that at the top. The heat capacity of liquid H2O is 80J/K*mol. Calculate the increase in Temperature.

In this question, u have to make an assumption that all the potential energy stored in the water by virtue of it's height is converted to heat energy when it falls to the bottom. the potential energy of 1 kg of water ( u could choose any mass.. it doesn't matter.. i chose 1 kg for simple calculation) at 50 m height,
is U =mgh = 1 * 9.81 m/s^2 * 50m

= 490.5 J. this energy is completely converted to heat.

now, heat = m * c * del T,
m= mass
c=specific heat
del T = change in temp.

or, 490.5 = 1*80 * del T
or, del T = 6.131 Kelvin

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