Phys Sc 430 Name_________________

Mystery Box Lab 2

Purpose: To use Ohm’s Law in order to discover how resistors are connected in two mystery boxes.

Procedure:

1. Connect a power source

and an ammeter to the

mystery box as

shown to the right.

2. Set the power at 5.0 V. Record the current between the required points (see chart below)

CONTENTS: C3 series = (3) 200 W; C4 series = (4) 100 W;	BOX #	Current measured between 1 and 5 or 1 and 6	Current measured between 1 to 2	Current measured between 2 to 3	Current measured between 3 to 4	Current measured between 4 to 5	Current measured between 5 and 6
	C3 101					Don’t measure	Don’t
	C3 102		Don’t	Don’t		Don’t measure	Don’t
	C3 103				Don’t		Don’t
	C3 201			Don’t		Don’t measure	Don’t
	C3 202			Don’t		Don’t measure	Don’t
	C3 203		Don’t measure			Don’t measure	Don’t
	C3 204		Don’t measure			Don’t measure	Don’t
	C3 301						Don’t
	C3 401		Don’t measure			Don’t measure	Don’t
	C4 101		Don’t
	C4 102		Don’t	Don’t		Don’t	Don’t
	C4 201				Don’t		Don’t
	C4 202			Don’t		Don’t	Don’t
	C4 203		Don’t		Don’t		Don’t
	C4 204		Don’t				Don’t
	C4 205		Don’t		Don’t
	C4 206		Don’t			Don’t	Don’t
	C4 207			Don’t		Don’t
	C4 208			Don’t		Don’t
	C4 301						Don’t
	C4 302
	C4 401		Don’t				Don’t
	C4 402					Don’t	Don’t
	C4 403		Don’t	Don’t			Don’t

Analysis:

1. Using the measured current and voltage, determine the resistance between each pair of points. If you were asked not to measure certain points, R = 0.

CONTENTS: C3 series have (3) 200 W; C4 series have (4) 100 W;

BOX #

Resistance calculated between 1 and 5 or 1 and 6

Resistance calculated between 1 to 2

Resistance calculated between 2 to 3

Resistance calculated between 3 to 4

Resistance calculated between 4 to 5

Resistance calculated between 5 to 6,if applicable

2. Based on the resistances you obtained, determine how many resistors, if any, existed between each pair of points on the circuit.

Conclusion: Explain how you arrived at your answers.