The ampere, often shortened to “amp”, is the base unit of electric current in the International System of Units.

An ampere hour or amp hour is a unit of electric charge or current flow over time.

**Formula to calculate amps hours.**

**Example:**

Suppose a battery provides 200 Amps for 3 hours. Calculate the electric charge in amp hours.

Thus, the battery’s electric charge was 600 amps hour.