Lab 3

In the lab ---

	1. Note the values of resistor and capacitor.

	2. Connect circuit (a) and get data for charging and discharging
	   ( using hand held timer )

	3. Get computer graphs for charging and discharging of circuit (a)

	4. Get computer graphs for discharging of circuits (b), (c), (d).


At home ---

	1. Plot V  vs. t  for charging and discharging of circuit (a)

	2. Plot I  vs. t  for discharging ( circuit (a) ).

	3. Get the time constant from discharging computer graphs.
	   (for all circuits)

	4. Plot V  vs. t on SEMI-LOG graph paper for discharging 
	   ( for all circuits, but on one graph paper. )

	5. find slope of line on semi-log graph and find time constant 
	   using the slope.

	6. Find the equivalant capacitance for each circuit using the 
	   time constant from computer graph and from semi-log graph.
	   Compare with given/calculated capacitance.


Questions you might try answering ---

	1. How do you expect the graph of I  vs.  t  for a charging capacitor
	   to look like ? Explain.

	2. What can you infer about the rate of charging/discharging of the
	   capacitor ? Can you explain why ?

	3. This might be a little vauge but why does the graph on semi-log
	   graph paper come out to be a straight line when the graph from the 
	   computer was a curve ??????