Sunday, June 13, 2010

AC SINE WAVES AND MORE...


< That is a ac sine wave.

R.M.S stands for root means squared. value is peak value x .707

peak is the + of the sine wave were as the trough is - of the sine wave.


Peak to peak is 325 negative and 325 positive = 650 v.

Frequency is the hz which is 50hz= 50 x per sec.

the time of wave length is 360 from signal one.

Sunday, May 30, 2010

My spreadsheet.

football.

FlUxLiNeS.

The four rules of flux lines are as follows,

1. they travel north to south.

2.If a current-carrying conductor is grasped with the left hand, with the thumb pointing in the direction of electron current flow, the fingers will point in the direction of magnetic lines of flux.

3.Unlike poles attract each other.

4.they always try shoten

Sunday, May 23, 2010

EXAM!

Tomorow there is a exam....but not just any exam , a maths theory.I think that there will be

vectors

networks

si units

resistors

percentages

e12

force

resistors

Sunday, May 2, 2010

slide show

resistor colour code.

we covered resistor color codes last week. In that lession we learnt how to read a colour sheet and figure out what resistance certain resistors are.As you can see to the right its rather straght forward to read , apart from how to figure out the tolirance which you divied the value of resistor by 100 then x it by the tolerance percent.

Sunday, April 18, 2010

computer eganomicks

i have not a clue about what the hell this is about...apparently its all about how you are in relation to your pc .....

1. back position.

2. monitor position .

3. screen brightness.

4.room lighting.