Pacemaker problem

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Pacemakers which are designed for long-term use commonly employ a lithium-iodine battery capable of supplying 0.42 A x h of charge. (a) How many coloumbs of charge can such a battery supply? (b) If the average current produced by the pacemaker is 5.6 mcA, what is the expected lifetime of the device?

I am pretty sure I have to use the equation I = Q/t, so Q = It? How do I get t, since it is not mentioned at all? Does this have anything to do with the "x h" mentioned in the problem?

stunner5000pt

what unit make up an Ampere??

since I = Q/t
and time is in what units?

can you figure out how to d oyour problem now??

FlipStyle1308

A = C/s, so C = As = (0.42)(3600) = 1512C. As for part (b), what is 5.6 mcA? I see the A, but was does mc mean?

stunner5000pt

mc = micro (althouhg usually they use the symbol mu [itex] \mu [/itex])

micro = 10^-6

FlipStyle1308

Okay, I correctly solved this problem, thank you!