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184_notes:cap_charging [2018/09/27 13:15] – dmcpadden | 184_notes:cap_charging [2022/10/19 14:40] (current) – valen176 | ||
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Section 19.1 in Matter and Interactions (4th edition) | Section 19.1 in Matter and Interactions (4th edition) | ||
- | [[184_notes: | + | /*[[184_notes: |
- | [[184_notes: | + | [[184_notes: |
===== Charging and Discharging Capacitors ===== | ===== Charging and Discharging Capacitors ===== | ||
- | Over the last two weeks we have been building a fairly robust model of what happens to the charges both on the surface of the wires and those moving through the wire. Now we are going to introduce a circuit element called a capacitor and see what changes about the electron current, the electric field and the surface charges. [[184_notes: | + | Over the last two weeks we have been building a fairly robust model of what happens to the charges both on the surface of the wires and those moving through the wire (through resistors). Now we are going to introduce a new circuit element called a capacitor and see what changes about the electron current, the electric field and the surface charges. [[184_notes: |
{{youtube> | {{youtube> | ||
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As this process continues, the capacitor plates lose more and more of their charge, so the electric field gets smaller and smaller causing the bulb to get dimmer and dimmer. Eventually, the capacitor plates lose all of their charge (both become neutral plates), so the electron current stops completely because there is no longer an electric field around the wire. | As this process continues, the capacitor plates lose more and more of their charge, so the electric field gets smaller and smaller causing the bulb to get dimmer and dimmer. Eventually, the capacitor plates lose all of their charge (both become neutral plates), so the electron current stops completely because there is no longer an electric field around the wire. | ||
- | It is important to note here that //__this is no longer a steady-state current situation__// | + | It is important to note here that //__this is no longer a steady-state current situation__// |
==== Charging a Capacitor ==== | ==== Charging a Capacitor ==== | ||
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[{{184_notes: | [{{184_notes: | ||
- | === Role of the Resistor === | + | ==== Role of the Resistor |
- | When charging or discharging a capacitor, there is usually a resistor placed in the circuit (like a lightbulb or some other kind of resistor) because the resistor helps control both the maximum current possible and the time it takes to charge/ | + | When charging or discharging a capacitor, there is usually a resistor placed in the circuit (like a lightbulb or some other kind of resistor) because the resistor helps control both the maximum current possible and the time it takes to charge/ |
- | === Video Demo === | + | ==== Video Demo ==== |
Here is a video demonstration of a lightbulb and capacitor circuit, charging and discharging. | Here is a video demonstration of a lightbulb and capacitor circuit, charging and discharging. | ||
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==== Examples ==== | ==== Examples ==== | ||
- | [[: | + | * [[: |
+ | * Example Video: Looking at a Capacitor as it's Charging | ||
+ | {{youtube> |