Aim: To investigate OHM’S Law.
Hypothesis: It is expected that as the resistance increases the current will decrease.
Introduction: OHM’S Law states that the passing through a conductor between two points is directly to the (i.e. or ) across the two points, and inversely proportional to the between them.
The mathematical equation that describes this relationship is:
Independent Variable: changing the resistance (OHM’S)
Dependant Variable: The current (A) is decreased because of the increasing resistors.
Constant: The voltage is kept constant but is changed at the end of each test to make the investigation more accurate.
Materials:
Method:
- Collect materials listed in above diagram
- Set up apparatus shown above
- Set the voltmeter to 1 volts and place the lead in the 5 OHM’s resistor
- Turn to the Power Pack and record the reading on the ammeter
- Repeat step 3 and 4 2 more times.
- Change the volts to 3,5,7,9,11,13 and 15, remembering to only record with the 5 OHM’s resistor.
- Record the results using the 5 OHM resistor
- Repeat steps 4 – 7 but instead of using the 5 OHM’s resistor, use 10 OHM’s, 18 OHM’s and 56OHM’s resistors
- Clean up all equipment and analyze the results
