Purpose:

The purpose of this experiment is to learn to measure the voltage output of the solar cell and the light intensity output of the light sensor of the NXT.

Equipment:

• solar cell
• voltage probe
• NXT
• light source
• ruler
• colored film filters

Procedure: I. Voltage

1. Find the voltage output of the solar cell with light and from a distance of 0 cm by using the labview.
2. Open up Excel and title the data 0 cm and save/close it when done.
3. Next, use the light source from a certain distance.
4. Open up Excel and title the new data the distance you picked and save/close it when done.
5. Repeat steps 3-4 two more times with 2 other distances. Ex: 0, 5, 10, etc.
6. Afterwards, make a Voltage vs. Distance graph.

Data:

Graph:

Interpretation:

As the distance of the light increases, the voltage decreases.

Procedure: II. Light Intensity

1. Shine the light source onto the solar cell and use labview.
2. Open Excel and title the data collected No Filter. Save/close afterwards.
3. Repeat steps 1-2 with 3 different colored filters.
4. Make a bar graph.

Data:

Graph:

Interpretation:

With no filter, the output is a lot higher and stronger than the ones with colors. The light intensity output for red is a lot weaker than yellow and green. Yellow is stronger than red but weaker than green. Green is stronger than both red and yellow.