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11 b Because it is NPN transistor the current flow is from emitter to base and here you DON'T need a thermistor (This is for temperatures and here we don't have to note the temperature) Your question why don't we keep Variable resistor at b and LDR at A this has a lot to explain but lemme give it a go so when the light intensity decreases(becomes dark) the resistance increases for LDR and now when Resistance increases Voltage increases and we need a higher share of voltage at B not at A because we need the PD across the Base to e larger enough for the base current to switch on the collector-emitter current as when the large current flows from the collector to emitter the bulb will light and at A is has Less share of resistance from the power supply.Guys a Question plz: http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s12_qp_31.pdf Q11 b! In Gap A why cant u PuT Light Dependendant Resistor! Why should we put on Only in Gap B! Any Help Would Be Helpful, Thanx IN ADVANCE!!