What quantity is measured by a battery rating given in ampere-hours Explain.
Step 1 of 2:
First we have to make sure that we understand what is an ampere.
The ampere (SI unit symbol: A), often shortened to "amp", is the SI unit of electric current. (dimension symbol: I) and is one of the seven SI base units.
The ampere is equivalent to one coulomb (roughly 6.241×1018 times the elementary charge) per second. Amperes are used to express flow rate of electric charge. For any point experiencing a current, if the number of charged particles passing through it - or the charge on the particles passing through it - is increased, the amperes of current at that point will proportionately increase.
The ampere should not be confused with the coulomb (also called "ampere-second") or the ampere hour (A⋅h). The ampere is a unit of current, the amount of charge transiting per unit time, and the coulomb is a unit of charge. When SI units are used, constant, instantaneous and average current are expressed in amperes (as in "the charging current is 1.2 A") and the charge accumulated, or passed through a circuit over a period of time is expressed in coulombs (as in "the battery charge is 30000 C"). The relation of the ampere (C/s) to the coulomb is the same as that of the watt (J/s) to the joule.