# units question

by ehrenfest
Tags: units
 P: 1,998 If a coulumb is defined as the amount of charge carried by a current of one Ampere in a second, why is its units Amperes seconds and not Amperes per seconds?
 HW Helper P: 858 $$I=\frac{dQ}{dt}$$ by definition and so $$Q = \int I\;dt$$ which has a unit of (amperes x seconds) seems obvious to me, do I understand your question correctly?
 P: 1,998 Yes, I see how it works mathematically. But I just thought "the amount of charge carried by a current of one Ampere in a second" was similar to the amount of charge carried by a current of one Ampere per second" so it would have units of Amperes/S
HW Helper
P: 8,962

## units question

No because a coulomb is a total amount of charge not a rate, so after 2 seconds you have 2 coulombs.
 HW Helper P: 858 yeah, another example Energy = Power x time and Energy is not a rate, while Power is. so amount of charge is like "energy" in this analogy

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