Last Sync: 2022-08-21 18:30:05
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tactonbishop
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7 changed files with 9 additions and 169 deletions
1
.obsidian/app.json
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.obsidian/app.json
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.obsidian/appearance.json
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.obsidian/core-plugins.json
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.obsidian/core-plugins.json
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"daily-notes",
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"templates",
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"note-composer",
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"command-palette",
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"editor-status",
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"starred",
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"outline",
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"word-count",
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"file-recovery"
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1
.obsidian/hotkeys.json
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.obsidian/hotkeys.json
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{}
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141
.obsidian/workspace
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.obsidian/workspace
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@ -8,20 +8,18 @@ tags: [physics, electricity]
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> Electrical current is the movement of electrons from negatively charged atoms to negatively charged atoms when an appropriate external force is applied.
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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).
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So current is the flow of electrons. Charge is the quantity that flows.
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> The amount of current is the sum of the charges of the moving electrons past a given point.
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We use the symbol $I$ to stand for current in equations.
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## Why current exists
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Current exists because of the [first law of electrostatics](/Electronics/Physics_of_electricity/Coulombs_Law.md).
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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.
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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.
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When the terminal 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. This is **voltage source**.
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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**.
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_The diagram below illustrates the flow of current where the circles are electrons knocking into each other to generate current:_
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_The diagram below illustrates the flow of current where the circles are electrons knocking into each other and passing current:_
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@ -0,0 +1,5 @@
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---
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categories:
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- Electronics
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tags: [physics, electricity, exponents]
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---
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