1. The problem statement, all variables and given/known data If you have a series 'light-meter' circuit with a cell EMF of 12V that must include both an LDR and a resistor only (in series), which way would you put them around to make this most effective and why? ~~~That is, would you have LDR then resistor, or resistor then LDR? And what would be the reasoning for this. 2. Relevant equations n/a 3. The attempt at a solution If you have a series 'light-meter' circuit with a cell EMF of 12V, wouldn't the appropriate arrangement of a resistor and an LDR be to have the positive end of the battery connected to the LDR and then the resistor, as opposed to having a resistor and then LDR? I can't work out why though.