**1 ampere (1 A)** in SI (International System of Units) is defined as:
> **1 ampere = 1 coulomb per second (1 A = 1 C/s)**
This means that if **1 coulomb of electric charge** flows through a wire or circuit in **1 second**, the current is **1 ampere**.
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### In simple words:
If a wire carries **a certain number of electrons** (which make up electric charge) and **that amount is equal to 1 coulomb** moving every **second**, then the **current in the wire is 1 amp**.
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