# how long will batery run

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• #10359

if i have bulb of 100w and power it by 12v, 55mah batery how long batery should run, also i vould convert voltage to 220v

#11549

#11749

Can you please explain in detail how you calculated this answer? It would make everyone understand.

#11751

100=12*i

i=8.34A

55mAh

no of hours = mAh/mA

noh= 55/8340

=.00659~~~~~

convert to mins *60 = .3956

convert to secs *3600 = 23.74

#11782

mAh is representinthe unit of which quantity in electrical teminology

#11902

it's easy…you only use this formula…

I=Q/t

Q=muatan baterai 55mah

So,,,

t=Q/I                                                          I=P/V = 100W/12V = 8,33A

=(55×0,001×3600)/8,33

=23,76 Sec…

Regard,,

Hendra Marluga

PT.Taikisha Indonesia Engineering

#11904

it's depend to tho load, as I thik
let see: U=R*I, where U=12V supplied from the battery, and R is the resistance of the Load supplied by the battery.
the current is given by: I=U/R.

The power of battery is 55mAH
no of hours of a static load, with a Z impedance is = mAh/mA, whare mA is the current truth the load,
so, Time= 0.055/I (I in Amper)

I suppose

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