#### transgalactic

##### Banned

1.

i know that a diode is short circuit when the currect threw it is positive

and open circuit other wise

but the graph of it says

when the current goes from zero till infinity

the voltage is zero (which is fine)

but

that on current 0 the voltage goes from zero till minus infinity

what does it mean " zero till minus infinity"?

i cant see how it means open circuit

2.

why a battery gives a constant voltage no matter the current?