I have a circuit diagram to analyze that looks wrong to me. It is fairly straight forward and I will attempt to describe it. It is an unlabelled power source with the neg terminal feeding a photocell, that part I understand. Here is the problem, that same neg branch of the circuit also feeds into the collector terminal of an NPN transistor with the base terminal of the NPN transistor receiving the switched neg fom the photodiode. It appears the intention of the design was to use the photodiode to switch the transistor which switches a light. Kind of like how the steet lights come on at dark. My question is, can an NPN transistor function with this bias, neg to collector, switched neg to base and pos side of light bulb connected to emmitter?