# Differences

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184_notes:examples:week6_drift_speed [2018/06/11 15:53] curdemma |
184_notes:examples:week6_drift_speed [2021/06/07 20:49] (current) schram45 |
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===Approximations & Assumptions=== | ===Approximations & Assumptions=== | ||

- | * The wires have circular cross-sections. | + | * The wires have circular cross-sections. This is typical of real wires and allows us to use the diameter of the wire to calculate the area properly. |

* Using the [[184_notes: | * Using the [[184_notes: | ||

===Representations=== | ===Representations=== | ||

* We represent electron current as $i=nAv_{avg}$. | * We represent electron current as $i=nAv_{avg}$. | ||

- | * We represent current as $I=|q|i$. Current is charge per second. Electron current is electrons per second. We multiply by $q$ (the electron charge) to get charge per second. | + | * We represent current as $I=|q|i$. Current is charge per second. Electron current is electrons per second. We multiply by $q$ (the electron charge) to get charge per second. |

- | * | + | |

====Solution==== | ====Solution==== | ||

We can use the [[184_notes: | We can use the [[184_notes: |