AC to DC Rectifier Simulation
This simulation shows how a full-wave bridge rectifier converts alternating current into pulsating direct current. The ideal diodes redirect both halves of the AC waveform so that...
14 Electric Fields
Moving charge between two charged spheres
This simulation is made upon request by a colleague teaching JC2 this year. The motion of a mobile charge between two source charges is governed by Coulomb’s law ($F =...
Electric Potential between Two Point Charges
In preparing for blended learning lessons for my JC2 students, I tweaked the Gravitational Potential applet made last year for a similar display of the electric potential between...
Using a mobile phone in a petrol station.
So it's safe to use a mobile phone in a petrol station. But not wearing nylon. For more on this, read the Straits Times article :...
Explanation for Water Bending with Static Electricity
It's interesting to note the differing views regarding the explanation for how a thin stream of water can get bent when a charged object is placed near it. It started with these...
Ionisation of Air to Remove Static Electric Charges
Materials Wool PVC pipe or plastic comb String Lighter Procedure Hang the string from an elevated position. Leave the bottom end free. Rub the PVC pipe with wool. This deposits...
Water Bender
A thin stream of water can be easily bent using a plastic comb or ruler which was previously rubbed with wool. This demonstrates the attractive forces between unlike charges....
Electroscope
An electroscope is a device that can be used to detect or measure the amount of charge in its vicinity. One of the earliest electroscopes is the gold-leaf electroscope which was...