TRANSFORMERS

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TRANSFORMERS
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Induced Current Review

• The effect of inducing a current in a coil by
  moving a magnet inside itis used for the
  generation of electricity in power plants
• There are two types of generator or dynamo.Both
  turn rotational energy into electrical
  energy. 1. One  type involves rotating a coil
  inside a magnet. 2. The other type involves
  rotating a magnet inside a coilBoth types
  produce ALTERNATING CURRENT.

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Why do we need transformers?

• In most cases, machines and appliances using
  electricity are manufactured to operate using a
  specific voltage and frequency. However, not all
  countries- and sometimes not all regions within
  the same country- generate the same voltage and
  frequency in their electricity.

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TRANSFORMERS

• This is where transformers com in. Transformers
  adjust the voltage coming into the appliance to
  the proper level, and move it through the
  appliance to keep it running properly.

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TRANSFORMER

• A transformer can change electrical energy of a
  given voltage into electrical energy at a
  different voltage level. It consists of two coils
  arranged in such a way that the magnetic field
  surrounding one coil cuts through the other coil.
• Transformers can step up the voltage or step it
  down.
• We step up voltage to send it over long distances
• We step down voltage in order to use in houses

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This transformer's job is to reduce the 4160
volts down to the 240 volts that makes up normal
household electrical service. It is a step down
transformer
                                                                                   
http//science.howstuffworks.com/power3.htm
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Step Up Transformer at Power Plant
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TRANSFORMER

• The factor which determines whether a transformer
  is a step up( increasing the voltage) or step
  down (decreasing the voltage) type is the "turns"
  ratio. The turns ratio is the ratio of the number
  of turns in the primary winding to the number of
  turns in the secondary winding.

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Step-up Transformer
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http//www.ibiblio.org/kuphaldt/electricCircuits/A
C/AC_9.html
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• https//www.youtube.com/watch?vZjwzpoCiF8A
• https//www.youtube.com/watch?vVucsoEhB0NA

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EXIT TICKET

• On a piece of paper answer the following
  questions
• What is the difference between AC and DC?
• How do we generate electricity?
• Why do we need transformers?