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