I got an image for you...

... ok, so If I switch the switch ON, then would the electron flow on the red wire that goes to Load 1 have any change at all? Will Load 1 experience ANY difference if I switch the switch ON/OFF?

only if the total load is greater than the current capacity of the power supply, other than that no.

ok, another question.

 

I have this R/C Car circuit board and I want to add another motor on there for extra power. I will also hook up another battery in parallel (for extra juice).Can the board be damaged by the extra power surge from the other motor?

 

Thanks for helping!

if the Motor is transistor switched, and you add another, even with a second battery, then it will still damage the transistor, they`re only rated at X amount Power dissipation.

shucks... I was hoping that the X power would be high enough to handle extra load.

silicon heatsinking compound would probably be enough depending on the size of the car.

how would you connect the motor mechanically?

 

if you were really stuck for power switching, you could try relays.

does this car have variable speed? if not, it's a simple matter of rigging two single pole relays the right way. then you can run as much power as the contacts can handle.

if you want, i'll post a schematic.