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.
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: