If switches X and Y are open, as shown, which lamps will be lit?
None of the lamps
Lamp 4 only
Lamps 1, 2 and 3
All of the lamps
If you want lamps 1 and 2 in this circuit to light up, what position will the switches be in?
Both switches open
Both switches closed
Switch 1 open, switch 2 closed
Switch 2 open, switch 1 closed
If you want only lamp 1 to light up, which switches should be open or closed?
Switch 1 open and switch 2 open
Switch 1 closed, switch 2 open
Switch 1 closed, switch 2 closed