Name:_______________________________Date:_______________Time:____________

Course:_________________
_______________________________________________________________________

Purpose: To investigate Ohm’s law and measure resistances.

Apparatus: Transformer (6 volt), rheostat (89 ohm), 6- connecting wires (banana plug), light bulb,  voltmeter, and digital multi meter (DMM), and unknown resistances.

Theory & Procedure

DATA:     Unknown resistance A

Resistance Value from PC/Interface =__________ Is it Ohmic or non-ohmic?___________

Set the voltage, measure the current, and then calculate R. (Include units for I & R)

Voltage, V(volt)

Current, I

Resistance, R

0

0

XXXXXXXXX

0.5

-

-

1.0

-

-

1.5

-

-

2.0

-

-

2.5

-

-

3.0

-

-

3.5

-

-

Plot V versus I, and determine the slope.

 

II. Unknown resistance B: 

Resistance Value from PC/Interface =___________Is it Ohmic or non-ohmic?__________

Set the voltage, measure the current, and then calculate R. (Include units for I & R)

Voltage,V(volt)

Current, I

Resistance, R

0

0

XXXXXXXXXXX

0.5

-

-

1.0

-

-

1.5

-

-

2.0

-

-

2.5

-

-

3.0

-

-

3.5

-

-

Plot the above data also on the earlier graph and determine its slope.  Print a hard-copy.

 

III. Unknown resistance, LIGHT BULB.

Resistance Value from PC/Interface =______________Is it Ohmic or non-ohmic?___________

Set the voltage, measure the current, and then calculate R & P. (Include units for I, R, and P)

Voltage, V (volt)

Current, I

Resistance, R

Power, P

0

0

XXXXXXXXXX

-

0.5

-

-

-

1.0

-

-

-

1.5

-

-

-

2.0

-

-

-

2.5

-

-

-

3.0

-

-

-

3.5

-

-

-

4.0

-

-

-

4.5

-

-

-

5.0

-

-

-

5.5

-

-

-

Plot V versus I, on a separate graph and print a hard-copy.

Conclusion: