You will conduct the same investigation today. Are the cloud conditions the same or different? Repeat the same experiment that you did before. Remember, if it is going to be a fair test you must do it exactly at the same time as the first day.
Making predictions
Predict the change in solar readings during 20-minute period.
Record your predictions along with the weather conditions in the word processor. Refer to Technical Hints to see how to use the Word Processor.
Collecting data
Before you go outside, create a spreadsheet to record your observations. Refer to Technical Hints to see how to create a spreadsheet.
Once outside, two students from each group should attach the multimeter to the lead wires on the solar cell across a resistor as shown. You may need to use masking tape to make sure the connections are secure.
On your spreadsheet make the following recordings:
Use the multimeter Program to record the voltage every two minutes for 20 minutes. Refer to Technical Hints to see how to use CC DMM program.
At the same time you take a voltage reading, record the air temperature near the solar cell.
At the same time you take a voltage reading, record the cloud cover. Make an estimate of how much of the sun is covered by clouds: no clouds/ full sun, 3/4 sun, 1/2-sun, 1/4, full cloud cover. Remember that you should not stare directly into the sun. It can cause damage to your eyes!
Creating a graph
Transfer your voltage readings into a spreadsheet. Refer to Technical Hints to see how to use to transfer collected data to a spreadsheet.
Make an x-y line graph of the voltage readings. Refer to Technical Hints to see how to make an x-y line graph.
Answer Question 6 in "Analysis".
