OK, Kwame, I'll try to make it even easier for you. In this diagram,
**broken link removed**
what is the difference, if any, between closing the one switch (top example) and closing both switches (bottom example)?
What happens if you only close one of the bottom switches? What happens if one is closed, the other is open, and you then close it?
(By the way, that symbol on the left is my new creation meaning "any source of 'lectricty, whether AC or DC, positive or negative".)