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Capacitance Applets
How to make a homemade capacitor  YouTube. 8 mins  4 Star  
How a capacitor works 
Charging and discharging a capacitor 
4 Star 

Graph of Voltage and Current changing over time 
4 Star 

To show that a charged capacitor stores energy  demonstration  MyYouTube. 4 mins  
Factors
affecting Capacitance 
Simple interactive applet  change the factors and notice the change in capacitance 
4 Star 

Demonstration using a multimeter 
MyYouTube. 4 mins 

Variable Capacitor applet 
See what a real capacitor looks like, and see how the overlap area changes in practice. 
4 Star 

A
capacitor for tuning radios 
See how a capacitor is used to tune a radio receiver 
4 Star 

PowerPoint Presentation 
Excellent Introduction / Revision for Current, Voltage and Capacitance, from Maire Duffy in Clonkeen College 
5 Star 