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.