Batteries
Batteries are the type of power storage element Which stores electrical charge in chemical form. When battery get connected across the load, It converts chemical energy into an electrical energy.
Batteries produces DC power ;and having 2 terminals ‘Positive’ & ‘Negative’. There are many types of batteries in the market, some of them are listed below :
- Lithium-ion (Li-ion)
- Nickle Cadmium (Ni-cd)
- lead Acid
- Nickle metal hydride(Ni-MH)
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Batteries Specifications
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Battery specification mainly includes voltage & its capacity/rating. In an image above sealed lead acid battery for UPS been shown. Which is having the rated voltage is 12Volts with rated capacity is 7Ah.
But I was curious; why do battery rating/capacity in Ah. I was thinking about it, how ??
After thinking for hours, I got nothing. Finally I searched it out. When I got the answer you couldn’t believe the answer came from Basic Electricals which you can get from any basic electrical book in 1st or 2nd page .
“If you don’t know. I suggest, First think about it & then see the answer !”
Why do batteries are rated in; Ah ?
Whenever we go market for a water tank. The main factor in our mind; is the storage capacity Because water tank is used to Store water. & Water capacity is been measured in liters.
Similarly
Batteries are not storing water. Batteries are storing Electrical charge (Q ). Therefore rating/capacity must be related to charge.
We know that
i= dq/dt (Current is flow of charge with respect to time in particular direction)
where, i= current, q= Charge , t = Time
Now multiply dt on both sides in equation.
We get, dq = idt .
Charge(q) is equal to i×t
((i)Current’s unit is Ampere(A) & (t)time units is hour(h) that’s why batteries are rated in Ah.
I hope you get the answer.