Electrolytic capacitors use a conducting surface inside a liquid electrolyte. They do not charge and discharge as rapidly as film capacitors do. They have polarity and so they have to be attached correctly. There are two leads; one will have a + and the other a -. This means one lead is "positive" and one is "negative". There are two different styles: axial, where the leads are connected to each end, and radial, where the leads are connected to one end. Electrolytic capacitors are printed with capacitance and voltage rating.
Since the voltage rating can be low, it is important to check that the electrolytic capacitor is not overcharged. Capacitors can be separated from a battery, then connected in series. Because the capacitor is polarized, the positive terminal must be connected to a negative terminal. This creates "correct polarity" through the electrical circuit and prevents breakdown.
Some electrolytic capacitors are unpolarized, meaning that either side can be positive or negative. These are mostly used in loudspeakers to block low-frequency signals (bass) from reaching high-frequency (tweeter) drivers.
Condenser
Condenser may mean:
Strategy
Strategy is a word which was first used by the military. It comes from an ancient Greek word for the general officer commanding all the armed forces of a state. A strategy is a long term plan on what to do to achieve a certain goal. When talking about the near future, people often use the word "tactics". Military theorist Carl von Clausewitz said "tactics is the art of using troops in battle; strategy is the art of using battles to win the war". Today, the word "strategy" is in common use; people might talk about "business strategy", for example.
The distinction between strategy and tactics applies to any planning which might be done against an enemy or opponent. Strategy is what we broadly intend to do to reach our long-term goal or objective. Tactics is the detailed steps which are used as our progress is opposed by the opponent. For this reason, tactics are short-scale and flexible. Strategy, on the other hand, is changed as little as possible. It may be that our goal simply cannot be reached. In that case, a search goes on for a new goal and a new or adjusted strategy. Often, in war, chess or business, roughly the same tactics are still used to get to a different goal. Negotiation is another area where the distinction between strategy and tactics is especially clear.
Design pattern
In Computer science, a Design pattern is an abstract solution to a certain problem. Design patterns are used in object oriented programming. They give a possible solution to a problem of designing software.
Design patterns became popular around the year 1995. They also simplify the language between computer scientists. Ideally, a design pattern should be reusable many times. It is like a brick of a house, it can be used for many different problems. One can also build bridges with bricks, not only houses.
These examples are actual examples of design patterns as they are in use. They have not been simplified. It is only the language used to describe them that has been made simpler.
The flyweight design pattern is used to minimize the use of many similar objects. In a text-processing system each letter can have some attributes like formatting, typeface, and size. While it would be possible to create a new object for each character in the document and give it these attributes, it is extremely expensive.
Instead it would be better to create one object for each type of formatting and link the letter to that information. That needs a lot fewer objects. The only extra information that would need to be stored is the word or letter's position in the document. All similar letters would use the same object to define font, size, and other properties.
Another easy to understand pattern is called "Singleton". It is used when there can only be one instance of a given class. That class usually has some static method (e.g. getInstance()) which returns a new instance. It also saves the instance internally. So if it already created the instance, it can simply return it.
Amarillo, Texas
Amarillo is a city in the U.S. state of Texas. It is in the northern part of Texas. The city's economy is mostly based on cattle. In 2000, 173,627 people lived there.
Lansdowne, Pennsylvania
Lansdowne is a suburb of Philadelphia, Pennsylvania in the US.
Gillingham F.C.
Gillingham Football Club is an English football club. They are based in the town of Gillingham, Kent. They are currently in Football League One. They play home games at Priestfield Stadium. Gillingham are managed by Steve Lovell and the chairman is Paul Scally. The club captain, Gabriel Zakuani, plays in defence. They finished their last season (2017-18) in 17th.
Round (music)
A round in music is a song which can be sung by two or more groups of people. One group starts off and the next group start to sing the same song a bit later. It should sound nice together. When a group gets to the end of the song they start again. They can go round and round, singing it several times.
Usually rounds are in 2, 3 or 4 parts (meaning that they are for 2, 3 or 4 groups of people). When a group of people sing or play a round they usually sing it an agreed number of times. This means that the group which starts last also finishes last.
"Frère Jacques" is a famous French round. "London's Burning" is an English round. Both those rounds can be sung in 4 parts.
The oldest round that we know is "Sumer is icumen in". This is a very famous piece of music because it is the oldest piece of music we know that was written down. It was written around 1250 by a monk. It can be sung in 4 parts with 2 bass drones (held notes).
Writing music by making one part imitate another is called canonic writing. Rounds are a kind of canon.
Gall bladder
The gallbladder is a pear-shaped organ in your abdomen. It stores about 50 ml of acidic liquid (bile) until the body needs it for digestion. That liquid helps digest fat. The gallbladder is about 7-10cm long in humans. It is dark green in color because of the bile in it. It is connected to the liver and the duodenum by the biliary tract.
Addenbrooke's Hospital
Addenbrooke's Hospital is a large hospital in Cambridge, England. The hospital lets people in to look around, once every two years. You can visit the mortuary, the operating theatres and the hospital roof.
Koala
Koalas ("Phascolarctos cinereus") are herbivore marsupials that live in the eucalyptus forests of eastern Australia. They are the only living species in the family Phascolarctidae. They are related to the wombats.
Koalas are often called "koala bears", because a koala looks like a small bear or teddy bear. However, it is not a bear, it is quite a different type of animal.
Koalas have brownish-grey or silver-grey fur, and a big pink, dark red or/and black nose. They have sharp claws which help them to climb.
Koalas also have finger prints which look the same as human finger prints. Finger print experts have had difficulty in being able to tell if the prints are from a human or koala. Finger prints are rare among mammals that climb trees. Scientists do not know why the koala has them, but their best guess is that it helps the koala choose leaves to eat.
Koalas are mostly active at night. They live in trees and are rarely found on the ground. Koalas have two unusual characteristics.
They eat leaves of eucalyptus trees. Koalas do not drink often, they get most of their water from the eucalyptus leaves they eat. Eucalyptus leaves are poisonous, but koalas do not get poisoned. This is because they have certain bacteria in their digestive tract that can detoxify the poison in the leaves. Koalas, however, have to sleep long hours because eucalyptus leaves do not produce much energy and also because the digestive process takes a long time.