Essay On Voltmeter

Aim: The aim of this experiment is to measure the effect of different distances in centimeters, on the intensity of light using a voltmeter on a clear light bulb using a photovoltaic cells to detect the intensity of the light at different distances. The voltmeter will provide the readings of the light intensity with the Voltage as the unit of light intensity.

Hypothesis: I expect that the intensity of the light (measured by the voltmeter detected by the PVC) coming out of the light bulb to decrease as the distance in centimeter between the photovoltaic cells and light bulb increase. So I presume that the light coming out of the light bulb will reach a maximum distance covered, then the intensity will start decreasing. The relationship is an inverse relationship.

The distance between the PVC and the light bulb is considered a dependent variable as the distance is measured with the 100 cm ruler.

Independent variables: The distance between the PVC and the light bulb.

In the experiment the PVC moves 20 cm farther from the light bulb each time we repeat the experiment; which means it changes after every three trials according to this specific experiment. The distance here is also considered an independent as it changes.

Controlled variables: The angle of the lamp; the angle of the lamp will remain constant during the whole experiment to increase accuracy of the outcome. Watts of Light bulb; the light bulb will remain the same at 100 Watts. The ruler; the 100 cm ruler with a 0.5 cm precise was not changed, it was used to take all measurements for distance between the PVC and Light bulb.

Proposed Method: Ruler (100cm) photovoltaic cells Voltmeter Lamp Crocodile clips 100W light bulb Place 100 cm ruler on the table. Attach 100W light bulb on to the lamp. Connect the crocodile clips from voltmeter to the photovoltaic cells. Place the photovoltaic cells 20 centimeters away from the