September 12, posting
For an example of an 'Open' EEI task sheet, click here. Photovoltaic power generation employs solar panels comprising a number of cells containing a photovoltaic material. The Australian Government provides incentives for the use of PVs for both domestic and industrial use you can save money, and save the environment.
Solar photovoltaics generates electricity in more than countries and, while yet comprising a tiny fraction of the GW total global power-generating capacity from all sources, is the fastest growing power-generation technology in the world. Between andgrid-connected PV capacity increased at an annual average rate of 60 percent, to some 21 GW.
A good EEI would be to measure current as a function of the angle of incidence of sunlight all within a short period of time eg 30 minutes ; measure current when collector is perpendicular to rays during the day how should that go?
But maybe you'll need to consider more than current; perhaps the power output is more important. If so, you could put a load on the circuit resistor and measure V and I. In the method shown below, Moreton Bay College students are measuring the effect of angle on the flow rate hence power output of a electrical water pump.
This was Year Energy output of a solar panel II You could also investigate the effect of shade on the output of a panel. In this photo, students are using layers 1, 2, 3 etc of shade cloth. It would also be interesting to see the effect of light of different wavelength to see if the solar cells are sensitive to all wavelengths.
You could use coloured cellophane - but then that reduces intensity and not all coloured cellophane has the same percentage transmission.
This limitation makes photovoltaic cells an unreliable source of power for unattended or remote devices, such as solar-powered traffic signs or NASA's Mars Rover.
For large-scale solar plants to maintain their maximum efficiency, the photovoltaic cells must be kept clean, which can be a challenging task in dusty environments. One good EEI would be to investigate the effect of dust on the solar panel. This is a harder EEI than the two above. It involves setting up a solar panel a short distance from an incandescent bulb eg 15 cm and adding controlled amounts of "dust" eg bentonite clay powder, fine sand, icing sugar to the face of the panel spread evenly.
It is a good idea to adjust the panel so it is working at maximum power. Do this by setting up the circuit on the left below, using either a variable resistor or fixed resistors that can be varied from 0 ohm to ohm.
Plot a graph next figure to see the maximum power point. Then add the bentonite 0. A good article is in Physics Education, V45, Septemberpage Solar panel output and temperature The output of a solar photo-voltaic PV panel changes during the day for two reasons: Here's what one user Cabel said on the Whirlpool Forum: I have 16 Suntech panels.
I don't have the actual voltage outputs vs temperatures, but comparing my best clear day since installation, Any cloud cover on these days seems to help output a lot also. I have got I also have black tiles but have a good 50mm gap between roof and panels so it should have reasonable airflow.
This suggests a good EEI. Then with constant illumination, you could put the PV panel on top of a hotplate and crank up the temperature.
How high a temperature - well, you can decide. Alternatively, you could hold the temperature constant and vary the illumination.Potassium-argon ‘dates’ of recent Mt. Ngauruhoe lava flows.
As you can see from the ‘dates’ in the above table the lava flows that were less than 55 years old were given dates from , years to million plus or minus 20 thousand years. Seasons Greetings from the RSGB Membership Services login required, follow the link below or click the cover image.
RadCom December. George Galloway. “The kind of consensual frenzy I watched in the House today, with Corbyn’s nuanced position openly derided even on his own side was chillingly familiar to me.
A useful site to take some example mock tests is schwenkreis.com Questions are The Foundation licence is designed to get you involved in amateur radio as Intermediate resources | Thurrock Acorns Amateur Radio Club The revision manual 'amateur radio Exam Secrets', relevant to all three exams, contains useful additional information .
THE SPIKE. It was late-afternoon. Forty-nine of us, forty-eight men and one woman, lay on the green waiting for the spike to open. We were too tired to talk much. Mendon to Light Gazebo for Christmas and Hold 20th Anniversary of Festival of Trees.
On Sunday, November 25th at 6 PM, The Mendon Festival of Trees Committee members are planning a lighting ceremony at the Gazebo in the park in Mendon.