Ohms Law

Only available on StudyMode
  • Download(s) : 56
  • Published : December 3, 2012
Open Document
Text Preview
An Investigation of Ohm’s LawStephen McGill
(22044566)

Results from test using 25Ω Resistor:

Voltage(Volts)| Current(mA)| Resistance(Ohms)|
0| 0| 0|
0.57| 20| 28.5|
1.01| 40| 25.25|
1.49| 60| 24.83|
2.01| 80| 25.12|
2.51| 100| 25.1|
3.0| 120| 25.0|
3.51| 140| 25.0|
4.0| 160| 25.0|
4.5| 180| 25.0|
5.03| 210| 23.95|
5.52| 230| 24.0|
6.02| 250| 24.08|
6.51| 270| 24.1|
7.0| 290| 24.13|
7.5| 310| 24.2|
8.0| 330| 24.2|
8.53| 350| 24.4|
9.02| 370| 24.4|
9.5| 390| 24.35|
10.0| 410| 24.4|
10.5| 430| 24.4|
11.03| 460| 23.9|
11.52| 480| 24.0|
12.03| 500| 24.0|

An Investigation of Ohm’s LawStephen McGill
(22044566)

Results from test using 12v 5w Filament Lamp:

Voltage(Volts)| Current(mA)| Resistance(Ohms)|
0| 0| 0|
0.49| 70| 7.0|
1.01| 90| 11.22|
1.5| 110| 13.63|
2.01| 130| 15.38|
2.52| 150| 16.8|
3.0| 160| 18.75|
3.5| 180| 19.44|
4.01| 190| 21.1|
4.53| 200| 22.65|
5.01| 220| 22.77|
5.49| 230| 23.87|
6.03| 240| 25.12|
6.53| 250| 26.12|
7.01| 260| 26.96|
7.53| 270| 27.88|
8.02| 280| 28.64|
8.51| 290| 29.34|
9.0| 300| 30.0|
9.52| 310| 30.7|
10.03| 320| 31.34|
10.5| 330| 31.81|
11.0| 340| 32.35|
11.51| 350| 32.88|
12.02| 360| 33.38|

An Investigation of Ohm’s LawStephen McGill
(22044566)

3. 25Ω Resistor

How can you find the Resistance, R?

The equation for Ohm’s law is V=IR, where V is Voltage, I is Current and R is Resistance. To transpose this equation for Resistance, R, it would R=V/I. From the graph the y-axis is current, I (mA) and x-axis is Voltage, V (Volts). To calculate the resistance from the graph we have to calculate the gradient (gradient = difference in y values/difference in x values). As the answer for the...
tracking img