SPE TECH
Kinds of wires
1. TW(thermoplastic moisture resistant wire)
-interior house wiring
-up to 600v ,60 degrees C wet/dry application
2.THW(thermoplastic heat and moisture resistant wire)
-interior house wiring
-up to 600v ,75 degrees C wet/dry application
3.THHN/THWN(thermoplastic heat resistant wire wire w/nylon jacket)
-up to 600v ,75 degrees C wet,90 degrees dry
4.DUREX WIRE NON-METALICSHEATED CABLE
-600v building wire 60 degrees dry/above ground
5.TF WIRE(thermoplastic fixtures)
-<600v>dry/wet location
-ligthing fixtures/interior appliance wire
6.TFN(thermoplastic fixtures w/nylon jacket)
-<600v ,75 degrees C wet,90 degrees dry
-ligthing fixtures/interior appliance wire
7.AAC(All Aluminum Conductor)
-used as overhead transmission and distributions of electric power
8.DUPLEX CORD((thermoplasticparallel cord/spt)
-used for appliance wiring for circuits not exceeding 300v
9.PE(Polyethelyn)Covered AAC
-used as secondary service drop wire
-600v phase to phase from a utility's distribution line of users attach point
-can be used as tranmission line
-aerial installation

SCIENCE
Two Basic Types of Cells

All cells fall into one of the two major classifications: prokaryotes or eukaryotes.
Prokaryotic Cells
Pro = “before”, karyon = “nucleus”
Prokaryotes are evolutionarily ancient. They were here first and for billions of years were the only form of life. And even with the evolution of more complex eukaryotic cells, prokaryotes are supremely successful. All bacteria and bacteria-like Archaea are prokaryotic organisms.
All organisms are composed of one or more cells.
Cells are the basic unit of structure and function in organisms.
All cells come only from other cells.
Eukaryotic Cells
Eu = “true”, karyon = “nucleus”
Eukaryotic cells are more complex, evolving from a prokaryote-like predecessor. Most of the living things that we are typically familiar with are composed of eukaryotic cells; animals, plants, fungi and protists. Eukaryotic organisms can either be single-celled or multi-celled.

SCIENCE
Parts of the Animal Cells

Cell Membrane: A cell membrane works like a screen. It lets the good things in like nutrients and lets the bad things out like waste. It is like a sieve.
Cytoplasm: Cytoplasm is the jelly-like part of the cell where the action takes place. It is where the nutrients are used.
Nucleus: The nucleus is the brain of the cell. It controls the cell, and tells it what to do. The nucleus also contains the DNA which is like a blueprint. A blueprint is a plan that people use when they build. A cell's blueprint is the plan the cell uses when it reproduces.

SCIENCE
Plant Cells

Plant cells are cells that are in plants. Plant cells are like animal cells, but they have a cell wall and chloroplasts. Here's a labeled picture of a plant cell. You will see all the main parts of the cell. Listed below are definitions of those words. Read on to learn more about photosynthesis.

Cell Membrane: A thin layer that surrounds the cell.
Cell Wall: A rigid layer that surrounds the cell membrane of a plant cell.
Chloroplast: (KLOR-o-plast) A cell structure in which photosynthesis takes place, and it contains the chloropyll.
Chlorophyll: (KLOR-a-fil) A green substance in plant cells that helps to make food.
Cytoplasm: (SIGH-ta-plaz-em) The jellylike liquid in cells where activities take place.
Nucleus: (NEW-kle-us) The dark structure inside the cell that controls the cell's activities and contains material such as DNA.
Photosynthesis: (foto-SIN-thi-sis) The process when plants use lights energy to make food.

MATH
Solving Problems Involving System of Linear Equations (Work problems)

Ex.

In a day,Rey can plow 1/4 of a ricefield and Rolly can plow 1/6 of it.If they worked together,how long will it take them to plow vthe whole field?

(1/4+1/6=1/t)12t

3t+2t=12
5t = 12
5t/5 = 12/5
t=2 2/5 days

MATH
Solving Problems Involving System of Linear Equations
(Investment problems)

Ex.
Two investments are made totaling P15 000.Part of the P15 000 is invested at 9% and part at 10%.For a certain year,these investmentsyield P1 432 in simple interest.Find the amount invested to each rate.

let a=1st investment at 9%
b=2nd investment at 10%

(equation 1) (a+b=15 000 )-0.1
(equation 2) 0.09a+0.16=1432

0.09a+0.16=1432
-o.19+0.16=-1 5 000
_______________
-0.01a/0.01 =-168/0.01
a =P 6 800

b=15 000 - a
b=15 000 -6800
d=P8 200

9%=P6 800
10%=P8 200

Solving Problems Involving System of Linear Equations
(Mixture problems)

Ex.
One canned juice drink is 15% lemon juice;another is 5% lemon juice.How many liter of each should be mixed together in order to get 10L that is 10% lemon juice.

(equation1) x+y=10L
15%(x)+5%(y)=10L(10)
(equation2) 0.15x+0.05y=10(0.1)

o.15x+o.o5(10-x)=1
o.15+0.5-0.05 =1 (transpose 0.5 to the other side)
0.1x/ 0.1 =0.5/0.1
x = 5
15% lemon juice=5L
5% lemon juice=5L

MATH
Solving Problems Involving System of Linear Equations(Uniformotion problems)

Ex.

A train leaves station x and travel east at 30kph.2 hours later,another train leaves the same station and travels in the same direction on a parallel track at 45 kph.At what point will the faster train overtake the slower train?

d=rt
da=30t
db = 45t2

30t=45t2
t1=2+t
t2=t

da =30(2+t)
db =45(t)
60t =45t
60+30t=45t (transpose 30t to the other side)
60=45t-30t
60/15 =15t/15
4 = t

da =30(2+4)
=30(6)
=180 km

db =45(t)
=45(4)
=180 km