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10
Electronics/Physics_of_electricity/Current.md
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@ -13,9 +13,10 @@ So current is the flow of electrons. Charge is the quantity that flows.
> The amount of current is the sum of the charges of the moving electrons past a given point.
## Why current exists
Current exists because of the [first law of electrostatics](/Electronics/Physics_of_electricity/Coulombs_Law.md).
When there is an excess of electrons at one terminal (i.e. negatively charged atoms) and a deficiency of electrons at the other terminal (i.e. positively charged atoms), a _difference of potential_ exists between the two terminals.
When there is an excess of electrons at one terminal (i.e. negatively charged atoms) and a deficiency of electrons at the other terminal (i.e. positively charged atoms), a \*\*difference of potential\_ exists between the two terminals.
When the terminals are connected to each other via a conductor (e.g. copper wire) electrons will flow along the conductor. This is provided that there is a source to supply electrons at one end and remove them at the other. We call this force the **voltage source**.
@ -38,11 +39,12 @@ $$
I = \frac{Q}{t}
$$
* $I$ = current measured in amps
* $Q$ = quantity of electrical charge measured in coulombs
* $t$ = time
- $I$ = current measured in amps
- $Q$ = quantity of electrical charge measured in coulombs
- $t$ = time
### Application
_Calculate the current in amps if 9 coulombs of charge flow past a point in an electric circuit in 3 seconds._
$$