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Email: rich ard walding. Tips on writing a Physics EEI? As electromagnetic theory was developed through the s it european drawer slides manufacturer ed found that magnetic field strengths could be given absolute values by the use of a coil carrying an electrical current.

In this EEI, you could measure the local magnetic field by comparing it to a know value created by a coil of known size, current, and turns. If you place a compass on a bench and let it point north, you can make it move towards the east or west by placing a magnetic field at right angles to the compass direction. The setup I made was two Helmholz coils with european drawer slides manufacturer ed gap between them for the compass.

I placed the compass on a little stand so that it was in the centre of the coils. Plastic water pipe is fine for the coils. I am indebted to Prof. Using a laboratory DC power supply set at 2V connected across a rheostat I was able to vary the current through the coils from 0 to 60 mA. The photos show some of the readings. I obtained a B H of Lastly, once you have B H you can calculate B E the overall magnetic field strength european drawer slides manufacturer ed the Earth at that location by dividing by the cos of the local declination angle.

The declination angle can be measured by a "dip needle" which should be available in most Science Departments. The actual value from GeoScience Australia for the date and location was This makes an ideal EEI European Drawer Slides Manufacturer List as you can modify your design in an attempt to reduce the error.

I'm not sure if I should have made the coil shorter in length by winding the wire over itself - perhaps it would be better but I wanted to be able to count the turns easily. In this experiment a wire is placed between the poles of permanent rare-earth magnets which are lying on the pan of an electronic balance.

When electric charge flows through the wire as an electric current there is a force acting upwards on the wire which results in an equal and opposite force downwards on the magnets. This is registered as a scale reading in grams on the balance.

The electric current is registered on an ammeter. Substituting for L, you will be able to determine the magnetic field strength of the field assumed uniform between the poles of the permanent magnets. Analysis of uncertainty will allow you to estimate the magnetic field strength and its percentage uncertainty. I give some hints about how the prac may proceed. In this video, a strong magnetic field is produced using two 10 mm x 5 mm rare earth disc magnets of surface field strength 0. A stiff copper wire is held rigidly between the poles of the magnets using a clamp and retort stand.

An electric current is passed through the european drawer slides manufacturer ed and the downwards force on the magnets and channel is shown by a scale reading on the balance in grams. The european drawer slides manufacturer ed length of the wire in the magnetic field is 10 mm.

A series of trials is undertaken with the current being increased from 0. This seems high but it is reasonable given the limitations of the measuring equipment and the design of the experiment.

I filmed this at Moreton Bay College in November with the assistance of my very talented student Kayleigh who skipped Chapel to help me. Chapter 7. I made another video March showing a close-up of the ammeter and electronic balance so that you can collect your own data if you can't get the equipment to do this practical, or if you've been away from school. It starts with a description of the equipment and forces. A changing current in european drawer slides manufacturer ed first circuit the primary creates a changing magnetic field; in turn, this magnetic field induces a changing voltage in european drawer slides manufacturer ed second circuit the secondary.

Transformers are some of the most efficient electrical 'machines', with some large units able to transfer Your EEI could be about the factors that influence the power losses. Is it frequency, voltage, current or just what? What ever you do, don't use mains V voltage. Use the school's laboratory power pack or european drawer slides manufacturer ed signal generator. Now make up an auxiliary coil from a non-ferrous material such as a piece of aluminium tubing that just fits inside the solenoid.

Give it say 6 turns of european drawer slides manufacturer ed copper wire and european drawer slides manufacturer ed it inside the solenoid. By Faraday's law of electromagnetic induction, a current will flow in the ring in such a direction to oppose the changing magnetic flux producing it.

Two effects will be observed in the CRO trace. There will be a decrease in amplitude accompanied by a shift in phase. The experiment could be then repeated with other input frequencies up to 3kHz. In one experiment I read, for a frequency of 2 kHz the voltage dropped from 4.

You can use this to calculate the inductance of the auxiliary coil it was 2. There are formulas that you could use to calculate the theoretical inductance and it should be close. For lower frequencies the inductance will be less. Energy output of a solar panel Photovoltaics PV is a method of generating electrical power by converting solar radiation into direct current electricity using semiconductors that exhibit the photovoltaic effect.

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 european drawer slides manufacturer ed 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 european drawer slides manufacturer ed 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. What to do?

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 european drawer slides manufacturer ed 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 european drawer slides manufacturer ed 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 european drawer slides manufacturer ed fixed resistors that can be varied from 0 european drawer slides manufacturer ed to ohm.

Plot a graph next figure to see the maximum power point. Then add the bentonite 0. A good article is in Physics EducationV45, Septemberpage Solar panel output and temperature The output of a solar photo-voltaic PV panel changes during the day for two reasons: one european drawer slides manufacturer ed that the sunlight falling on the panel changes probably peaks at noonand as the temperature of the panel rises its efficiency changes.

Here's what one user Cabel said european drawer slides manufacturer ed the Whirlpool Forum :. 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. Year 12 student Ryan Phillips from Villanova College, Brisbane, used an electric bar heater in front of the solar panel. The light stayed constant as the panel heated up and he got some interesting results see setup below. How to measure the rate of heat conduction is a big issue. It applies to the design of solar panels, drawing heat from electrical components and even materials used in dentistry.

Sometimes they mount semiconductors on diamonds to prevent damage from overheating, since diamonds have an extremely high thermal conductivity. It involves the periodic heating and cooling of a metal rod and measuring the temperatures with sensors along the rod in two positions a european drawer slides manufacturer ed distance apart. You will see the first wave of heat come past the first sensor and a minute or so later it will arrive at the next sensor. A plot of the data is quite revealing.

Below is the plot of such an experiment done by my hero Prof. Alexander Crichton Mitchell in Edinburgh on 9th January He was measuring the conductivity of ice. I repeated his experiment using an aluminium rod covered in bubble wrap with sensors held in place with zip ties.

All you need do is turn your lab hotplate on to 'full', and wait until it is fully hot the thermostat should click. Place the end of the rod on it for a short time you decide and then take it off.

You could then place it on some ice. Repeat this in a uniform and periodic fashion. The problem for you is how to display and analyse the data. Sure you can draw a graph that will show the time lag between peaks, and show the size of the peaks.

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