electro magnet

there are 3 ways,
*changing the number of coils of wire,
*changing the current in the wire,
*changing the material used for the core.

Is a measure of the magnetic field strength existing on a two dimensional surface.

it is a space around the magnet.

• 
  
four rues for them
they move from the north to the south
complete loop
cant be broken
path of least reluctance

• 
  
four rues for them
they move from the north to the south
complete loop
cant be broken
path of least reluctance

8 things tha are gonna be in the exam this afternoon

vectors
networks
percentages fractions and decimals
forces
w=m x g x h
ohms law
triangles
atomic theory
conductors and insulators

If R1 = 97Ω,
R2 = 41Ω, R3 = 9Ω, R4 = 8Ω, R5 = 6Ω, R6 = 54Ω,

to find the total resistance of this parallel diagram u

1. redraw the whole circuit you will add all the resistors except for r2 and r4 which you will add using this step (1/r2 + 1/r4=............) then you will place back all the resistors new resistance in ohms

now add all the resistance together and you will get the total Resistance

2. than you will try finding the voltage by using the formula (v=i X r = ) for every resistor .
in the parallel circuit the current will differ so now will use the formula i=v/r \
and so on so forth

spreadsheet

here is my spread sheet

https://spreadsheets.google.com/ccc?key=0AkhAyNVUmgoBdElMRXVZQ2k3dDhRa2pWN2ljQWxMZWc&hl=en

A parallel circuit is one of the two basic types of electric circuit that can be found in electrical devices. "Circuit" refers to the total path of an electric current, or flow of electrical energy, and includes devices such as resistors, which control the flow of voltage, or difference in electrical charge, and capacitors, which store electrical charge. Circuits fall into one of two categories: series or parallel. In a series circuit, all the components of the circuit are lined up in a single path so that the current flows through each component in order.

series and parellel circuit

A series circuit is a circuit where there is only one path from the source through all of the loads and back to the source. This means that all of the current in the circuit must flow through all of the loads.

slideshow stress

Stress management 1a

View more presentations from Our Group.

Newton's Cradle

computer ergonomics

ergonomics is all about the correct posture,lighting,height of screen, keyboard and seat. if u follow the proper rules you will have no trouble later on but if you don't you can get a sore neck,eyes and hands. afer every hour of work you should take at least 10-15 minutes of and there are various ways of doing that u could just stand up and close your eyes for a while or just look away from the computer but it will be more better to just move away and take a rest away from the computer.

- Once set up, wind energy uses kinetic energy from wind for free forever, enabling you to utilize the energy of a force of nature that has a total potential of power generation larger than the current power consumption from all the power sources combined.

- Wind energy is environment friendly and there are no carbon emissions or environmental hazards produced during power generation, as is the case with thermal energy.

- Wind energy is more efficient than solar energy if provided the right capacity and conditions. A small wind turbine can create as much energy as 5 to 10 solar panels combined.

- New designs and mechanism are being introduced through constant research to ensure the better use of wind turbines. Such has been the case in its improvement in output and noise reduction from what we used to get 5 to 10 years back.


The performance of wind mills depends on wind, weather and geography.

- Wind energy, comparatively to solar panels, requires greater maintenance due to moving parts and you would have to replace the bearings of the turbine once every 5 years.

- Wind mills can be a potential threat to the lives of flying animals like birds and bats.

- Wind mills are immediately noticed at a particular location, and their visual impact may affect the desirability and property values in the neighborhood, which could create a hurdle to its installation in the first place.

The pros are doesn't not create pollution or radio active wastes. They have less impact on the environment.it also can be used to provide electricity to each individual home. can also be used in a large scale for a large number of people. it is reusable.

The cons are it can be damaged in natural disaster such as thunder storms and tornadoes. The turbines can hit birds that try to fly between them. The blades can create a sound when it moves so can be a nuisance to people living near it

hydro power

The pros are it is reusable energy. Dams can store energy from rain water or river in case of any natural disaster such as a drought there can still be water left in the dam.

The cons are it can change the natural changes and seasonal changes that occur in the river.Dams are expensive to build.If a drought occurred may dry up and become useless>

we did this it was preety awsum to find out that even potatoes have voltage in them.with just puting one nail and copper in u can test for voltage which gives a reading of about 0.002 or asumthing like that it was pretty awsum to find out about different soures we use to get power in the country

this is what I want you to look at, right here

http://www.youtube.com/watch?v=hVBowAbEqbs

first week

the first week was awesome. met new people. and got used to uni life.