# Does the number of resistors make a difference?

I have got a simple circuit, where a relay is used to decide which LED lightens up (and I did a small mistake in the image: The power source is actually 12V, not 1V):

simulate this circuit – Schematic created using CircuitLab

Now, my question is: Would it be feasible to have two resistors instead of one, if you would link the wires behind the resistors instead of before them? Does this make any difference?

simulate this circuit

(Of course it does not make sense to use two resistors if it also works with one, but I'm curious ;-))

• "... if you would link the wires behind the resistors instead of before them?" I'm not sure I understand what that means. Can you describe it in other words or draw a second schematic? – Dan Laks Mar 6 '15 at 8:08
• I've updated my question. – Golo Roden Mar 6 '15 at 8:12
• The answer is yes. Both schematics would work equally well. – Dan Laks Mar 6 '15 at 8:17
• I don't see a reason to use a second resistor, at least with the given info. If you have two leds (with identical specs) and only one can be turned on at any given moment then a second resistor doesn't make a difference. On the other hand If your leds are not the same (e.g different color) then a separate resistor makes sense. – alexan_e Mar 6 '15 at 8:17
• Where it does matter is if two LEDs are on at once. Two LEDs in parallel sharing one common series resistor will hav the two LEDs driven unequally as the voltage across each is identical but the CURRENT will divide unequally. How unequally deoends on LED matching and it can be vey poorin some cases. – Russell McMahon Mar 6 '15 at 10:01