I was checking falstad and came around this resistor circuit which lost me completely :
Knowing that input voltage is 5v and current is 17mA :
1- Why is the voltage 0 after the 200Ohm resistor knowing that It's 3.4V before It ?
2- Why is the current flowing without voltage ? (here is the animation for those interested
3- When the current arrives at the first junction, 15mA take the first route, and 2mA take the 2nd route, why is that ?
4- Check this 2nd circuit :
Why closing the right bottom switch drops the voltage to 0 after the 100/400/800 resistors ?