I'm learning electronics and found this question below, which is exactly what I've been questioning myself. But there was no good answer there, so maybe someone here can help.
Suppose you have a 9 V battery that you connect to a load having a very low resistance (e.g. 0.1 ohm). From Ohm's law, the current would be I = V/R = 90 amps, which seems impossible to obtain from such a battery. If we suppose that the load will not burn, which of these options is the correct one?
1) The battery has a maximum power it can provide. For example, if this power is P = 100 W, then since P = RI^2 the current will be I = (P/R)^0.5 = 31.6 amps and the voltage V = RI = 3.16 V.
2) The battery has a maximum current it can provide. For example, if this current is I = 5 A, then V = RI = 0.5 V. I am aware the values given for P and I might not be realist.
I am just interested in the general behaviour of a battery (is current, power or voltage the fixed value?). Thanks for your help.
So far I've read datasheets for some batteries and found some intriguing data about how a battery behaves, given certain circumstances such as temperature, load (current discharge), and average voltage.
Beyond these factors, I'm trying to understand if there's a definitive quantification of the total "energy" of a battery? Since mAh, Wh and Joules seems to vary depending how the discharge occurs.
For example, this datasheet from energizer shows that the mAh capacity changes as a function of the discharge rate. If that's the case, is the 'total cell energy' varying?