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Maximum current from a battery 
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#1
Dec2113, 05:14 AM

P: 103

If we had a battery with internal resistance 1 ohm and 9 V.
If we connected to just wires ( resistance 0) i will produce a 9 amps current. Is this the maximum current? If we connect to this battery a 0.5 ohm resistor (in parallel ) the total resistance will be lower than one, will the current produced be greater than 9 amps? 


#2
Dec2113, 05:33 AM

Sci Advisor
P: 2,470

You can't connect a resistor so that it's in parallel with internal resistance of battery with respect to the voltage drop of the battery. So yeah, you get maximum current if you just short the battery out.



#3
Dec2113, 05:43 AM

P: 103

So basically maximum current = voltage/internal resistance and i can never surpass it



#4
Dec2113, 06:57 AM

P: 1,212

Maximum current from a battery
Yep.



#5
Dec2113, 10:14 AM

P: 3,252




#6
Dec2113, 11:47 AM

P: 103

Yup...i got it



#7
Dec2213, 10:03 AM

Sci Advisor
Thanks
PF Gold
P: 12,256

Otoh, interestingly, PV cells are usually characterised in terms of open circuit volts, short circuit current and maximum power output (at specified temperatures). Continuously taking nearshort circuit current is not too harmful for PV cells I believe. 


#8
Dec2213, 10:37 AM

P: 3,252

Very true. Model aircraft and car racing competitors carefully control the temperature of their battery packs to get the best out of them. It's possible to get very high currents out of some quite small cells if you know what you are doing.



#9
Dec2213, 02:12 PM

Admin
P: 23,718

Basically voltage is directly proportional to the temperature. 


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