Block+A+Group+8

Block A Group 8

Josh Oliver Taylor Hamilton

1. **__Question:__** How does light intensity affect the electrical output of a PV cell?

2. **__Hypothesis:__** If you increase the light intensity, then the electrical output of the PV cell will increase.

3. **__Materials needed:__** Light bulbs (25 watt, 75 watt, and 100 watt), light stand, multimeter, aligator clips, light meter PV cell, meter stick.

4. __**Procedure:**__ 1.) use 25 watt bulb, place light on ring 30 cm from the PV cell. 2.) connect alligator clips from miltimeter to PV cell. 3.) measure and record using the multimeter and light meter, leave light on for 1 minute. 4.) replace 25 watt bulb with the 75 watt bulb and repeat steps 2 and 3. 5.) replace 75 watt bulb with the 100 watt bulb and repeat steps 2 and 3.

5. Data Table
 * || 25 Watt Bulb || 75 Watts Bulb || 100 Watt Bulb ||
 * Light Intensity || 346 || 1440 || 3000+ ||
 * Electircal Output (Volts) || 4.25 || 4.65 || 4.74 ||

6. On graph paper.

7. Conclusion- As said in the hypothsis the end result was the same. By increasing the light intensity with higher watt bulbs it increased the electrical output of the PV cell. This is the same as a house using electricity like with the sun its always changing temperatures given off. So therefore having different light intenisty given off but normally the sun is always at the same height at each time of the day.

8. Problems with lab- For next time when this is tested to find the electrical output and light intensity is to have a light to where is is secured at one light and for sure not going to move and stay at the height when each bulb is replace. That was one of the big major problems was with keeping the light at the exact height wanted for each trial with the bulbs.