Question

I'm feeling really tiered and just can't think, please help if youcan. I might seem a bit lazy but I really don't feel well and thisis in for tomorrow :( :

1) with the aid of a sketch graph, describe how the resistance R ofa negative temperature coefficient (NTC) thermistor changes withtemperature T. (2marks) please explain how I should do thecurve/line of best fit for the graph thanks.

2) state how, and explain why, the resistance of the filament lampchanges as the p.d across it increases.

3) calculate the total resistance of the series combination of thefilament and the resistor.

4)calculate the internal resistance of the supply.

5) use fig 3.1 to calculate , for a p.d of 3v,
(I) the current in the lamp.
Answer:
I= V/R= 3/50=0.06 A

(ii) the power dissipated by the lamp.

6) suggest why the resistance of the lamp doesn't changesignificantly over the range of 0 to 2v.

7) the tungsten filament lamp is at room temperature when the p.dacross it is zero
I) state the resistance of the lamp at room temperature.


Thanks.