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Introduction to Electric Circuits
Link

A.C. and D.C.
If there's a better learning resource out there for electricity I've yet to find it.
Click on 'Grab a bag' to test for Conductors and Insulators
I'm waiting for Phet to convert this to html format

6 Star
       
Resistance due to movement of electrons
Link
Excellent animation of conductors, resistors and insulators in the first two minutes. But after that it starts to ramble. Youtube
4 Star
Resistance
     
Resistance at molecular level
link
Nice applet which shows what's going on at a molecular level in a filament bulb, although it is somewhat simplified. Can you say why? micro.magnet.fsu.edu
4 Star
Example of a non-ohmic conductor link A pickle (but don't write this on your exam paper!)
Short video clip - don't try this at home.
4 Star
Can a 9 volt battery prove fatal?
link
Surprisingly - yes! darwinawards.com  

Fat Bike caught on an Electric Fence!

link Youtube 3 mins.  
       
Introduction to Electric Circuits and Resistors
link
MyYoutube 22 mins.
       
Why metals conduct electricity
link
Nice animation from absorblearning.com
May only work with Internet Explorer
4 Star
Why voltage causes a current
link
Nice animation from absorblearning.com
May only work with Internet Explorer
4 Star
Resistance and Temp
link

Nice animation (take your time to understand it) to explain why resistance increases with temperature. From absorblearning.com
May only work with Internet Explorer

4 Star
 
link
Short demo from MIT tech tv showing that resistance decreases with decreasing temp
4 Star
       
Ohm’s Law Applets:
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One of the best. Note that you can change V or R, but you can't change I directly. This is because the current that flows can only be determined after setting values for the other 2. From pHet
5 Star
 
link
Very good simulation before you try the real thing yourself
micro.magnet.fsu.edu
4 Star
 
link
Nice simulation, but putting the voltmeter across both the resistor and the ammeter might be confusing. walter-fendt.de
4 Star
       
Resistors in Series and in Parallel      
Why are voltages in parallel the same?
link
. My attempt to explain a tricky concept MyYoutube 5 mins.  
Deriving the formulae
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Resistors in series and in parallel. MyYoutube 5 mins.  
Another go at it
link
MyYoutube 10 mins.  
       
Electric Circuit maths question. Part 1
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MyYoutube 10 mins. The comments are interesting if nothing else.  
 
link
MyYoutube Part 2. 8 mins  
       
Resistor colour codes
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Colour coded resistor, and also a chance to see the relationship between resistance and cross sectional area micro.magnet.fsu.edu
4 Star
       
Reading a Micrometer link Very user friendly, but I doubt if this can ever get asked in the Leaving Cert
faraday.physics.utoronto.ca
4 Star
 
   
How a variable resistor works
link
Simple but excellent animation of a rheostat. Move the pointer by grabbing the green dot on top.
From absorblearning.com May only work with Internet Explorer
5 Star
 
   
Potential Divider
link
Diagram of a heat sensor, from absorblearning.com
May only work with Internet Explorer
4 Star
Demonstrating the Potential Divider
link
MyYoutube 10 mins.  
 
   
Wheatstone Bridge
Theory: part 1 of 2
link
MyYouTube 3 mins  
Part 2 of 2
link
MyYouTube 3 mins  
Another go at explaining it
link
MyYouTube 18 mins  
       
Metre Bridge
link
Balance the bridge and then use your formula to calculate the value of the unknown resistor walter-fendt.de
4 Star
Demonstrating the Metre Bridge
link
MyYouTube 6 mins
Or alternatively here
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MyYouTube 6 mins  
       
Problems with measuring resistance
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MyYouTube 7 mins  
       
Mandatory Experiments      
Resistivity
link
Excellent. Play with the formula and see the variables change in the circuit . pHet
5 Star
 
link
MyYoutube 5 mins.  
  link mathsphysics.com 4 Star
  link YouTube video from c4science 4 Star
       
Variation of the resistance of a metallic conductor with temperature link mathsphysics.com 4 Star
  link YouTube video from c4science 4 Star
V versus I for metallic conductor
link
mathsphysics.com 4 Star
  link YouTube video from c4science 4 Star
V versus I for filament bulb
link
mathsphysics.com 4 Star
  link YouTube video from c4science 4 Star