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Technology / Capacitors

« on: 14/03/2008 23:53:54 »

Hello,

Can I have some help understanding capacitors?

I have a charging and discharging circuit. 

I insert a 2000microF cap into the circuit and record how long it takes to charge and discharge.

I take the 2000microF cap out of the circuit and put a 100microF cap in into the circuit and record how long that one takes to charge and discharge.

How does the length of discharge time change based on the size capacitor?

Thanks!
***Stby

2

Physics, Astronomy & Cosmology / Loss of current in a bulb?

« on: 24/01/2008 18:19:19 »

Thank you everyone, I was hoping there would be an easy answer so I'm going to have to digest what everyone here is saying. 

Conceptual Physics covers the same topics that a Physics class would cover but they are covered at a ~conceptual~ level - there is less math involved.  It works well as a high school freshman course to get the basics covered so that when a Physics course is taken later in school where the equations come in to play the foundation is already solid.

3

Physics, Astronomy & Cosmology / Loss of current in a bulb?

« on: 23/01/2008 00:07:11 »

Hello!

I'm new to teaching conceptual physics and electronics has come up and the kids are asking questions that I'm having a hard time answering.

In a simple circuit (battery, wire, bulb) Ohm's law indicates that the current is going to be the same no matter where the ammeter is placed in the circuit.  If the current is flowing from the battery through the bulb and then back to the battery again, what is "missing" when the current comes back out of the bulb if it isn't the current or voltage? 

Are we trying to mix an ideal situation that can be found on paper when drawing a circuit where there is no acknowledgment of loss of energy and the real world?

Thanks!!
***Stby

4

Radio Show & Podcast Feedback / Discuss: The Science of Addiction

« on: 10/01/2008 18:43:49 »

I think an addiction indicates you are no longer in control, the thing you are addicted to has control over you.  I'm sure you can quit this forum at any time... []