Ohms Law
An Investigation of Ohm’s Law Stephen 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 Law Stephen 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 Law Stephen 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
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 Law Stephen 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 Law Stephen 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