Friday, September 2, 2011

Experiment - determine the resistance of a light bulb

Circuit Diagram

How is the resistance of the light bulb calculated ?

From the graph, it is obvious that there are 2 clear sections of graphs.
Explain why are there 2 clear sections.

The resistance of the light bulb can be determined by finding 
the gradient of the graph for the first section (dim). 

However, the resistance CANNOT be calculated by finding 
the gradient for the second section (bright). Explain why.  

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