Your partner had hooked up wires every which way, the power supply is on full blast and the light that symbolizes your failing lab grade is not lighting up. So, like the genius you are, you say to your partner "Why don't you switch that wire? Resistivity is the longitudinal electrical resistance of a uniform rod of unit length and unit cross-sectional area or simply "how much resistance is in this wire? There are three types of carbon, fullerenes, diamonds, and graphite.
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?
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.
The volume expanded graphite is times greater than that of natural graphite used before. After the intercalant reactants are added to the graphite layers, the single sheets of graphene are separated by separation of large amounts of gases between the layers of graphite called the Vander-Waal's spaces. The aim of the investigation is to determine the resistivity of nichrome wire at varying dimensions. The nichrome wire is of 1 metre at 32 gauge and also of 0. 5 metre at 28 gauge. Resistivity is an electrical measure indicating how strongly a material opposes the flow of electric current. Resistivity is a measure of the resisting power of a specified material to the flow of an electric current taking into account of its length and cross-sectional area this is measured by Ohms-metres (Ωm) the resistivity of Aluminium is varying from to × 10−8 Ω.
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.
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: I have 16 Suntech panels.
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.Physics () Sample assessment instrument and student response Extended experimental investigation: Electrical conductivity of graphite This sample is intended to inform the design of assessment instruments in the senior phase of.
This Extended Experimental Investigation explored how the resistance and resistivity of graphite is impacted when a range of factors are varied. Pencils formed the basis of this EEI and all hypotheses and conclusions were backed with physics-related theories and actual results from conducted experiments.
This is an Essay / Project. Essay on An Investigation Into Electrical Resistance Aim Of The Investigation: always the same for a given material.
is called the “resistivity” and has dimensions of m R • Resistivity is a measure of how hard it is for current to flow through a material under the influence of an applied electric potential. Resistivity Investigation IMPLEMENTING The apparatus I set up for the experiment was correct since I followed the diagram and method on the plan step by step.
The circuit worked Investigation Into the Resistivity of a Wire Essay - Investigation Into the Resistivity of a Wire Aim: The aim of this investigation is to see how the length of.
|Investigation To Measure The Resistivity Of Graphite Essay Sample||Hire Writer The longer the wire is, not only do the electrons have longer to flow through the wire, there are also more collisions there would be between the electrons and the atoms.|
|The Resistivity of Graphite (EEI)||Graphene Graphene Graphene can be defined as one atom thick layer of carbon atoms arranged in a 2- dimensional hexagonal crystal lattice. The carbon atoms in the 2'dimensional planar structure is sp2 hybridized.|
Investigation To Measure The Resistivity Of Graphite Essay Sample. Aim.
The aim of the experiment is to find out the resistivity of graphite. The resistance which is measured in ohms of a resistor is applied with three basic elements. If you measure the diameter you can calculate resistivity ( Ω.m). For an EEI you could measure the resistance (V vs I) for 6B through to 2H pencil graphites using % graphite as the independent variable.