Ohm’s law
LO:
• Investigate the relation between V
and I using Phet simulation.
• State Ohm’s law.
Phet Virtual Lab- Alef 55-Big Idea-Slide 2
• https://phet.colorado.edu/sims/html/ohms-law/latest/ohms-law_en.html
• Click on the Lab Tab.
• Click on the battery at the bottom to the left of the screen to construct your
circuit with real objects.
• Connect, using connecting wires, a resistor across a cell.
• Add a switch to your electric circuit.
• Connect an ammeter in series with the resistor to measure
the current flowing through it.
• Connect a voltmeter in parallel with the resistor to measure the potential
difference across it.
• Click on the cell and vary the value of the potential difference of the cell from
0 V to 25 V.
• Record the values of the current and the potential difference across the
resistor each time you increase the value of the potential difference of the
Group task
https://phet.colorado.edu/sims/html/ohms-law/latest/ohmslaw_en.html
Potential Difference
of the Cell (V)
Potential Difference
(V)
Current (A)
Potential Difference(V)
Current(A)
0
0
0
0
5
5
0.50
10
10
10
1
10
15
15
1.50
10
20
20
2
10
25
25
2.50
10
Draw a graph of the potential difference versus the electric current of the resistor.
(You can use excel or any other graphing application. Insert your graph in this slide)
ohm's law
3
2,5
i(amper)
2
1,5
1
0,5
0
0
5
10
15
v (volt)
20
25
30
Conclude the relation between V and I.
When V increases I increases.
V is directly proportional to I.