# Ohms Law

(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...

Please join StudyMode to read the full document