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Introduction to Electric Circuits
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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

6 Star
       
Resistance due to movement of electrons
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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
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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?
4 Star

Example of a non-ohmic conductor

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?
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Surprisingly yes, but it's not very likely. But you would qualify for the Darwin Awards. Text based  
       
Introduction to Electric Circuits and Resistors
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MyYoutube 22 mins.
       
Why metals conduct electricity
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Nice animation from absorblearning.com
4 Star
Why voltage causes a current
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Nice animation from absorblearning.com
4 Star
Resistance and Temp
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Nice animation (take your time to understand it) to explain why resistance increases with temperature. From absorblearning.com
4 Star
 
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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.
5 Star
 
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Very good simulation before you try the real thing yourself
4 Star
 
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Nice simulation, but putting the voltmeter across both the resistor and the ammeter might be confusing.
4 Star
 
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I have already included this in the Current Electricity page, but it deserves a second look. Put the circuit together yourself before trying the real thing.
6 Star
       
Resistors in Series and in Parallel      
Why are voltages in parallel the same?
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. My attempt to explain a tricky concept  
Arrange the resistors any way you want
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Check to see what the net resistance is. You can also check Voltage and Current values at any point.
5 Star
 
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Fun game: calculate the net resistance but watch out; there's a time limit
4 Star
Deriving the formulae
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Resistors in series and in parallel. MyYoutube 5 mins.  
Another go at it
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MyYoutube 10 mins.  
       
Electric Circuit maths question. Part 1
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MyYoutube 10 mins. The comments are interesting if nothing else.  
 
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Part 2. 8 mins  
       
Resistivity Applets:
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Excellent. Play with the formula and see the variables change in the circuit
5 Star
 
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Colour coded resistor, and also a chance to see the relationship between resistance and cross sectional area
4 Star
Resistivity experiment
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MyYoutube 5 mins.  
Another go at it
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MyYoutube 5 mins.  
       
Resistor colour codes
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What it says on the tin. Play with the colours and note the value of the resistor
3 Star
 
Reading a Micrometer
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Very user friendly, but I doubt if this can ever get asked in the Leaving Cert
4 Star
 
   
How a variable resistor works
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Simple but excellent animation of a rheostat. Move the pointer by grabbing the green dot on top.
5 Star
 
   
Potential Divider
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Diagram of a heat sensor, from absorblearning.com 4 Star
Demonstrating the Potential Divider
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MyYoutube 10 mins.  
 
   
Wheatstone Bridge
Theory: part 1 of 2
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MyYouTube 3 mins  
Part 2 of 2
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MyYouTube 3 mins  
Another go at explaining it
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MyYouTube 18 mins  
       
Metre Bridge
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Balance the bridge and then use your formula to calculate the value of the unknown resistor
4 Star
Demonstrating the Metre Bridge
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MyYouTube 6 mins
Or alternatively here
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MyYouTube 6 mins  
       
Problems with measuring resistance
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MyYouTube 7 mins  
PowerPoint Presentation
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Excellent Introduction / Revision on Resistance from Maire Duffy in Clonkeen College
5 Star
       
V versus I for metallic conductor
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From mathsphysics.com  
V versus I for filament bulb
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From mathsphysics.com