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Sunday 30 August 2015

Circuits

Series Circuits
A series circuit has only one path for the current to flow. In a series circuit, the current through each of the components is the same and the voltage across the circuit is the sum of voltages across each components.

Parallel Circuits
In a parallel circuit there is more than one path for the currents to flow. If two or more components are connected in parallel they have the same potential difference(voltage) across their ends. The potential difference across the components are same in magnitude and they also have identical polarities.


Open Circuits
This is an electric circuit through which current cannot flow because the path is interrupted by an opening. It cannot conduct current because a switch is open, a wire is broken, etc. 

Closed Circuits
This is a circuit providing a continuous path through which the current can flow freely without any interruption. A closed circuit has a complete path for the current to flow.


Saturday 15 August 2015

Information Technology

What is hardware?
Hardware is the term used for the physical parts of the computer that you can see and touch. It is the collective name given to all the devices that make up the computer system. Without any hardware, a computer would not function.

Categories of Hardware
The five general categories of hardware that make up a computer are:

  • Input Devices
  • Output Devices
  • Memory Devices (Primary Storage)
  • Storage Devices (Secondary Storage)
  • Processor (Central Processing Unit)
Examples of Hardware
There are different kinds of hardware. Some examples are:

  • Keyboard 
  • Printer
  • Mouse
  • Scanner
  • Monitor
  • Speaker
  • Camera


Friday 14 August 2015

Milk Part 1

What is milk?
Milk can be defined as a white, creamy liquid that is produced by all female mammals for feeding their young. Milk is often spoken of as "Nature's" most perfect food. While not a complete food for human beings, it is the one food for which there seems yo be no adequate substitute. Milk is regarded as the main food for the young. It is consumed mostly by humans since it contains many valuable nutrients.  



The Food Value of Milk
Milk contains a lot of valuable nutrients. They are supplied in small amounts:

Proteins: 3.4%
Fat: 3.9%
Carbohydrates: 4.8%
Minerals: 0.8%
Water: 87.5%

Milk also contains both fat soluble vitamin A and D, and water soluble thiamine, riboflavin. Vitamin B2 is found in a greater quantity. Milk contains NO vitamin C. 

Types of Milk
There are five types of milk. These are:
  •  Fresh or untreated milk
  • Pasteurized milk
  • Powdered or dried milk
  • Full cream milk
  • Skimmed milk

Monday 10 August 2015

Pollution

Ages ago, as the population of mankind developed, 'pollution' had started. Pollution as the word suggests, is any unwanted or harmful stuff that can contaminate the environment. Pollution comes in many forms and types. These are land, air, water, noise, etcetera.



There are many causes of pollution. Emissions from motor vehicles are one of the leading causes of air pollution. It can also be caused by smoke from factories and chimneys. Dumping of garbage in your environment leads to land pollution. It may also be caused by volcanic eruptions and tsunamis. Another type of pollution is water. This can be caused by the discharge of garbage and toxic pollutants like pesticides and heavy metals in the water. Loud music and noise from factories leads to noise pollution. This may also be caused by noise from machines and human beings.

There are different effects of pollution. Some of them are bad while others are good. A good effect of pollution is when the biodegradable materials decompose, they provide nutrients for the soil. Air pollution can result to asthma, headaches, and the irritation of eyes, nose, etc. The emission of carbon dioxide can lead to global warming. Water pollution can result to waterborne diseases e.g typhoid. Contaminated water affects fish life in lakes and streams. Noise pollution causes hearing loss, stress, etc. Plants may not be able to grow properly because of pollution. 

As you can see, pollution is very dangerous to your health, the environment and plants. There are different causes and side-effects of pollution. This is why, we must try to prevent it, or atleast try to improve it.


Scientific Instruments Part 1

Altimeter- An instrument used for measuring altitudes.


Microscope- An instrument used for making very small objects appear large.

 


Telescope- An instrument used for seeing distant/far objects.


Telephone- An instrument used for transmitting the voice to a specific distance.

 


Microphone- An instrument used for increasing the volume of sounds or someone's voice.


TO BE CONTINUED...

Egyptian History Part 11

EGYPTIAN ARTIFACTS

Examples of Egyptian artifacts:



 

 

Can you name or identify any of the above?

Thursday 6 August 2015

"SPORTS" JOKES

 

1. Q: What is a ghosts favorite position in soccer?
A: Ghoul keeper.

2. Q: What is a cheerleaders favorite color?
A: Yeller!

3. Q: What is a Cheerleader's favorite food?
A: Cheerios!

4. Q: Why can't Cinderella play soccer?
A: Because she's always running away from the ball.

5. Q: Why did the basketball player go to jail?
A: Because he shot the ball.

6. Q: What do you call it when a dinosaur slides in to home plate?
A: A dinoscore!

7. Q: What animal is best at hitting a baseball?
A: A bat!

8. Q: What is harder to catch the faster you run?
A: Your breath!

9. Q: Why is tennis such a loud sport?
A: The players raise a racquet!

10. Q: Why do basketball players love donuts?
A: Because they dunk them!

11. Q: At what sport to waiters do really well?
A: Tennis, because they can serve so well.

12. Q: How do baseball players stay cool?
A: They sit next to the fans.

13. Q: Why don't orphans play baseball?
A: They don't know where home is.

14. Q: Why did the soccer say owwwwww?
A: Because the man kicked him.

15. Q: What is an insect's favorite sport?
A: Cricket!

Wednesday 5 August 2015

Mammals: HORSES

Horse
Horses are four legged animals that have had a long relationship with humans. The scientific name for horse is Equus ferus caballus. Horses are mammals as well as herbivores, meaning they only eat plants rather than meat. This mammal belongs to the taxonomic family Equidae. Some horses are domestic, while others remain wild.

 

Breeds of Horses
There are over 300 different breeds of horses. Horse breeds come in a number of different sizes, colors, and skill sets. There are three main types of horse breeds: Hot bloods are fast horses bred for speed and racing. Cold bloods are generally bred for strength and heavy work. Warm bloods are a combination of the other two types and are often used for riding competitions.

The different names given to horses:

1. Foal - a baby horse less than a year old.
2. Yearling - a young horse between the ages of one and two.
3. Colt - a male horse less than four years old.
4. Filly - a female horse less than four years old.
5. Stallion - a male horse older than four years old that is not a gelding.
6. Gelding - A castrated male horse.
7. Mare - a female hose older than four.

Horse Colors
Horses with different coat colors have different names. They are:

1. Bay - light reddish-brown to dark brown with a black mane, tail, and lower legs.
2. Chestnut - reddish color with no black.
3. Grey - black skin, but a mixed coat of white and black hairs.
4. Black - entirely black.
5. Sorrel - a type of chestnut with a very reddish coat.
6. Dun - yellowish or tan coat.
7. Palomino - a light golden color.
8. Pinto - a multicolored horse with patches of red, brown, white, and/or black.

A Horse's Diet
Horses actually spend most of their time eating! Horses are grazing animals and mostly eat hay and grasses. They also like legumes like peas and beans, fruit such as apples, and even carrots. Sometimes they are fed grains such as corn or oats.  

A Horse Eating 

A Horse's Anatomy
Parts of a Horse
A Horse's Teeth
Horses are adapted to grazing. In an adult horse, there are 12 incisors at the front of the mouth, adapted to biting off the grass or other vegetation. There are 24 teeth adapted for chewing, the premolars and molars, at the back of the mouth. Some horses, both male and female, will also develop one to four very small vestigial teeth in front of the molars, known as "wolf" teeth, which are generally removed because they can interfere with the bit. An estimate of a horse's age can be made from looking at its teeth.

A Horse's Behaviour

Horses are prey animals with a strong fight-or-flight response. Their first reaction to threat is to startle and usually flee, although they will stand their ground and defend themselves when flight is impossible or if their young are threatened. They also tend to be curious.  Horses communicate in various ways, including vocalizations such as nickering or whinnying, mutual grooming, and body language.

Horse Galloping
A Horse Sleeping
Fun Facts about Horses
  • Horses have excellent senses including good hearing, eyesight, and a tremendous sense of balance.
  • Horses can sleep standing up or lying down.
  •  Horses can run shortly after birth.
  • Horses have bigger eyes than any other mammal that lives on land.
  • Horse riding is often used as a form of therapy for people with disabilities.
  • Estimates suggest that there are around 60 million horses in the world.
  • Scientists believe that horses have evolved over the past 50 million years from much smaller creatures.
  •  Because horse’s eyes are on the side of their head they are capable of seeing nearly 360 degrees at one time.

Tuesday 4 August 2015

Food Chains & Food Webs

What is a food chain?
A food chain shows how energy from producers is passed from one consumer to another within an ecosystem. Most food chains have three to four links. It usually starts with a plant. A herbivore is an animal that only feeds on plants. A carnivore is an animal that feeds on other animals. Animals that feed on both plants and animals are called omnivores.


 

What is a food web?
A food web shows all of the feeding relationships in an ecosystem. A food web can be defined as a network of food chains which are interconnected at various tropic levels, so as to form a number of feeding connections amongst different organisms.