Timeline for Understanding Ohm and Kirchhoff [closed]
Current License: CC BY-SA 3.0
14 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Feb 5, 2014 at 12:34 | vote | accept | mbm29414 | ||
| Feb 5, 2014 at 2:48 | history | closed |
Matt Young Daniel Grillo Chetan Bhargava Joe Hass Dave Tweed |
Needs more focus | |
| Feb 5, 2014 at 1:09 | answer | added | FiddyOhm | timeline score: 1 | |
| Feb 4, 2014 at 18:57 | comment | added | Peter Bennett | @mbm29414: The circuit you gave is just an exercise to demonstrate Ohm's and Kirchoff's laws, and voltage dividers. If you connect a load of any kind across one resistor, you will have to re-calculate the voltages, as the current drawn by the load will upset things. If you connect another 3K9 resistor across R2, you effectively have 1.95K in that position. Voltage dividers such as this are very useful, but you must allow for any currents drawn from them when calculating the resistor values. | |
| Feb 4, 2014 at 18:38 | comment | added | mbm29414 | @PeterBennett Does that mean that if I connected a separate circuit to the pins of resistor R2 that it would have a voltage of 17.55? Or am I completely missing the point? Maybe a better, more basic question is to ask what the point of the circuit above would be. Clearly, without doing something with the current, you're just wasting the battery, right? So, what's the practical value of knowing that resistors cause voltage drop? | |
| Feb 4, 2014 at 18:33 | comment | added | mbm29414 | OK, so the circuit-builder tool is AWESOME!!! | |
| Feb 4, 2014 at 18:32 | history | edited | mbm29414 | CC BY-SA 3.0 |
updated wording and added circuit diagram
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| Feb 4, 2014 at 18:26 | comment | added | mbm29414 | @MattYoung Actually, it IS one progressive question. My understanding may be flawed, but I'm trying to understand voltage drop and how it may or may not relate to voltage regulators. This is my first post, so didn't know about Ctrl+M. Will fix. | |
| Feb 4, 2014 at 17:49 | comment | added | Peter Bennett | Would it help if, instead of "voltage Drop", you said "Voltage developed across the resistor"? - Same thing, but different point of view. | |
| Feb 4, 2014 at 15:21 | answer | added | Martin Petrei | timeline score: 5 | |
| Feb 4, 2014 at 15:18 | review | Close votes | |||
| Feb 5, 2014 at 2:48 | |||||
| Feb 4, 2014 at 15:04 | comment | added | Matt Young | First, when you're talking about a circuit, press Ctrl+M and draw it so we can understand what you're talking about. Second, you should really break this up into multiple questions. The LM317 part is not related to the first half. | |
| Feb 4, 2014 at 14:58 | review | First posts | |||
| Feb 4, 2014 at 17:10 | |||||
| Feb 4, 2014 at 14:41 | history | asked | mbm29414 | CC BY-SA 3.0 |