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Alright thanks,what are you studying now by the way?For the first one, I don't really know, but it is a principle. I think that since voltage remains the same in a a parallel circuit, the emf to be provided can be divided amongst the batteries.
For the second one, about the filament lamp, it is an 'increasing at a decreasing rate' graph (V plotted on the x-axis ...)
As I increase the voltage, the current in the circuit also increases. However, the temperature increases, which causes more resistance, and ultimately leads to current decreasing
For the thermistor, as the temperature increases the resistance decreases.
When it is hot, the graph will be ' Increasing at a decreasing rate' (I plotted on x-axis)
Basically, less resistance will be occurring in the circuit, so as the current increases, the voltage will at a point become constant. There is little resistance to stop the current
When it is cold, the graph will be the opposite and ...
PS,uff tumhari lehrati hoi zulfain