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Microscopic View of Current

Current from drift velocity (I = neAvd) | Electricity | Physics | Khan Academy

 Typical household wiring in the United States is 14-gauge copper wire. 14-gauge wire has a radius of <math display=‘inline’><mrow><mn>0.815</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">mm</mi></mrow></math>. What is the electron drift speed if a <math display=‘inline’><mrow><mn>10</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">A</mi></mrow></math> current is carried in a 14-gauge wire? 

 What is the current density in a wire with a radius of <math display=‘inline’><mrow><mn>0.815</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">mm</mi></mrow></math> carrying a current of <math display=‘inline’><mrow><mn>5.0</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">A</mi></mrow></math>? 

 What current does a <math display="inline"><mrow><mn>0.23</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">V</mi><mo>/</mo><mi mathvariant="normal" class="MathML-Unit">m</mi></mrow></math> electric field create in an iron wire of <math display=‘inline’><mrow><mn>0.8</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">mm</mi></mrow></math> mm radius? 

Anderson Video - Electron Drift Example

 What is the electron current in a gold wire with a radius of <math display=‘inline’><mrow><mn>1.5</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">mm</mi></mrow></math> when the electron drift speed is <math display=‘inline’><mrow><mn>1.0</mn><mo>&#x00D7;</mo><msup><mn>10</mn><mrow><mo>&#x2212;</mo><mn>4</mn></mrow></msup><mo rspace=“thickmathspace”>&#x2062;</mo><mi mathvariant=“normal” class=“MathML-Unit”>m</mi><mo>/</mo><mi mathvariant=“normal” class=“MathML-Unit”>s</mi></mrow></math>? 

Drift Velocity Derivation - A Level Physics

Drift velocity (concept & intuition) | Electricity | Physics | Khan Academy

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