Electronics - Ohm's Law - Discussion

If you want to measure the capacity of a single battery then the unit is Ah.

For ex: In the battery specification if it has been mentioned 2Ah it can supply 2A of current for 1 hour or 1A of current for 2 hours.

If you want to compare the capacity of two different batteries with the same capacity in Ah then we will consider Voltage of those batteries too. Hence the unit used here is kWh.
1 kwh= Voltage x Ah.

For ex: If a battery A contains of 2.2 V of 2 Ah has to be compared with battery B of a 9.6V battery of 2 Ah we use Wh.
Capacity of Battery A = 2.2 x 2 = 4.4 Wh
Capacity of battery B = 9.6 V x 2 Ah = 19.2 Wh

Extra information: If two batteries having the same voltage and capacity(in Ah) then we use another rating called C rating. It is an informal way of describing how much current the battery can safely deliver.

For Ex: If in a battery cover it has been mentioned 2.2 Ah 20 C rating then its capacity is 20 x 2.2 = 44A.

Battery capacity is expressed in AH.

Why it is not denoted as kwh.

Ah stands for ampere hour. 1Ah=3600 coulomb. Ah is a unit of electric charge.

So the AH means Ampere Hour right?

Capacity represents the specific energy in ampere-hours (Ah). Manufacturers rate a battery by giving an Ah rating that it can provide.

1Wh = 3600 Coulomb.

Very good explanations. Thank you.

Thank you for explaining it.

Thank you for explaining it.