Friday, February 12, 2010

I Was Not Surprise - NZ student accepts $32,000 bid for virginity


NZ student accepts $32,000 bid for virginity is one of a talk of the cyber town. For me I was not shock or even surprise about this girl who give his virginity bid for a money for her tuition because I know that every or one of a student in every country will do everything just to have a money to support its needs and this activity will continue if the government will not stop in creating and making their freaky and muddy corrupting activities. I understand what did the girl even-though it is not right to loose her purity in a right man and a right time. All I can say is selling his or her purity or being a virgin is a sin.

Tuesday, February 9, 2010

A Transformer

B. Identify appliances/equipment that require transformers.

All the appliances which are functioning or dependent to electricity has a transformer or required a transformer.

This are examples of appliances that requires appliances

C. Relate the voltage and current in the primary and secondary coils to the numbers of turn in each.

Hence the step-up transformer has a great loop in secondary coil, so in step-down transformer has a less amount of loop in a secondary coil. So the induce voltage of the step-up transformer is greater than the other. So as a whole if the secondary coil loops is increases the greater the induce voltage and the primary coil reduces its induce voltage with same as vise versa.

Step-up Transformer and Step-down Transformer

Step-up Transformer
In a step-up transformer the potential difference across the secondary coil is greater than the potential difference across the primary coil.
Step-Up Transformers are one of the really common and vital electrical tools used in power transmission and modification. They are usually the first major transformer in a transmission system and are often used in various forms throughout the system.

Step-Up Transformers are based on the same formulas that other transformers are, but the key element is that they convert voltages to higher volumes while reducing amperage and effects of resistance. This makes Step-Up Transformers ideal in long-distance power transmission use; by stepping up voltage and reducing amperage little energy is lost to resistance.

Step-down Transformer
Step down transformers are designed to reduce electrical voltage. Their primary voltage is greater than their secondary voltage. This kind of transformer "steps down" the voltage applied to it. For instance, a step down transformer is needed to use a 110v product in a country with a 220v supply.

Step down transformers convert electrical voltage from one level or phase configuration usually down to a lower level. They can include features for electrical isolation, power distribution, and control and instrumentation applications. Step down transformers typically rely on the principle of magnetic induction between coils to convert voltage and/or current levels.

Step down transformers are made from two or more coils of insulated wire wound around a core made of iron. When voltage is applied to one coil (frequently called the primary or input) it magnetizes the iron core, which induces a voltage in the other coil, (frequently called the secondary or output). The turns ratio of the two sets of windings determines the amount of voltage transformation.

Monday, February 1, 2010

Electromagnetic Induction

a brief description of electromagnetic induction, Micheal Faraday, and his work, including animation

Electromagnetic Induction: Demonstrations and Definition

Electromagnetic Induction

Three short Leaving Certificate Physics experiments using a coil and (a)a permanent magnet (b)a d.c. electromagnet (c) an a.c. electromagnet

Oersted's Experiment

Oersted's Experiment