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.When forces acting on an object which is at rest are balanced, then we say that the object is in a state of static equilibrium. The resultant of these forces equals .
In physics an object is said to be in mechanical equilibrium if it is in a state of transitional and rotational equilibrium.
For a system to be in transitional equilibrium the sum of the forces acting on the system, in all planes, must be equal to zero. Static Equilibrium Physics Lab IX Objective In this lab exercise the requirements for static equilibrium will be tested experimen-tally.
This will be done by analyzing problems of force balance, torque balance and a. For most students, the resultant was 0 Newton (or at least very close to 0 N). This is what we expected - since the object was at equilibrium, the net force (vector sum of all the forces) should be 0 N.
Torques in Equiibrium Lab by Tom Blum. PYL Rotational Equilibrium. It is easier to open a heavy door when you know where the hinges are. Then you know to apply your force at the opposite end of the door. (rotation).
Thus no net torque is another condition for static equilibrium. Part 1. Set up a lever-type system. Recall the following.
Apply what you know about torques by making a mobile.
|Top Selected Products and Reviews||This is what we expected - since the object was at equilibriumthe net force vector sum of all the forces should be 0 N. Another way of determining the net force vector sum of all the forces involves using the trigonometric functions to resolve each force into its horizontal and vertical components.|
|Equilibrium and Statics||This is what we expected - since the object was at equilibriumthe net force vector sum of all the forces should be 0 N. Another way of determining the net force vector sum of all the forces involves using the trigonometric functions to resolve each force into its horizontal and vertical components.|
|Senior Physics - Extended Experimental Investigations||Then you know to apply your force at the opposite end of the door. What you are doing here is for the given force maximixing your torque.|
|Equilibrium and Statics||Teacher guide featuring 15 labs designed for Advanced Placement Physics 1. Rotational Statics Lab Summary Students use a force sensor and tension protractor to demonstrate that the sum of the forces acting on an object in static translational equilibrium is equal to zero, and the sum of the torques acting on an object in static rotational equilibrium is equal to zero.|
Shown below are five horizontal arms with fixed 1- and 2-kg masses attached, and four hangers with ends .