how many coulombs are provided by a current of 0.01 ma in the calculator battery that can operate for 1000 hours

DearStudent,

Formula used is Q=It
where Q= Charge in coulomb
I= Current in ampere
t= time in seconds

Given, I= 0.01 mA = 0.01 * 10-3 A, t= 1000 hrs = 1000 * 60 * 60 sec
Q = I*t = (0.01 * 10-3 A)*(1000 * 60 * 60 sec) = 36 C
Hence Charge is 36 C.

​​​​​​Regards

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