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Electronics/Physics_of_electricity/Coulombs_Law.md Normal file
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Electronics/Physics_of_electricity/Current.md
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@ -6,14 +6,17 @@ tags: [physics, electricity]
# Current
When an appropriate external force is applied, the movement of electrons is from negatively charged atoms (negative ions) to positively charged atoms (positive ions). We call this **electrical current**.
> Electrical current is the movement of electrons from negatively charged atoms to negatively charged atoms when an appropriate external force is applied.
We use the symbol $I$ to stand for current in equations.
So current is the flow of electrons. Charge is the quantity that flows. Current exists because of the [first law of electrostatics](/Electronics/Physics_of_electricity/Coulombs_Law.md).
> The amount of current is the sum of the charges of the moving electrons past a given point.
We use the symbol $I$ to stand for current in equations.
## Coulombs and amps
We measure **charge** in Coulombs ($C$). A Coulomb is an aggregate of the charge of several electrons because their charge is so small: $6.24 \cdot 10 ^{18}$ electrons.
We measure **charge** in Coulombs ($C$). A Coulomb is an aggregate of the charge of several electrons because their individual charge is so small: $6.24 \cdot 10 ^{18}$ electrons.
We measure **current** in amps. When one coulomb of charge moves past a point in one second it is called an **ampere** (amp) represented as $A$.