PhET - Sims

Interactive Science Maths Fun Games- Simulations !

https://phet.colorado.edu/sims/html/circuit-construction-kit-ac/latest/circuit-construction-kit-ac_en.html

SCIENCE AND MATHS SIMULATIONS- INTERACTIVE GAMES TO LEARN BY FUN           
( EASY AND HAPPY NATURAL  LEARNING

WITHOUT anxiousLEARNING-PRESSURES OR TENSIONS )