Build on your intuition of electric fields by using this app.
Without the need of any math use the lesson to gain an understanding of the basic concepts related to electric fields.
Afterwords test your understanding by playing with the simulation.
The simulation let's you place charges wherever you like and see the resultant electric field.
Once you have placed some charges, place a charge which is free to move on the screen to see how its motion is affected by the other charges' electric field.
Increased touch area for buttons making them easier to press and charges easier to drag