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Generators and Transformers Northern Collegiate Institute

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Generators and Transformers Northern Collegiate Institute Powered By Docstoc
					Generators and Transformers
•A generator turns kinetic, mechanical energy into
 electrical energy.

•Recall that if a conductor is moved relative to a magnetic
 field, current will be induced in the conductor.
•There are two basic types of generators:
      AC generators
      DC generators

 The AC Generator
•There are two basic types of generators:
      AC generators
      DC generators

 The AC Generator




               A
                   B
•There are two basic types of generators:
      AC generators
      DC generators

 The AC Generator




                A
                    B
•There are two basic types of generators:
      AC generators
      DC generators

 The AC Generator




               B
                   A
Transformers
•Transformers are devices that
 can increase or decrease
 voltage for electrical devices
 that need specific amounts.
Types of Transformers

•A step-up transformer will increase the voltage in the
 secondary circuit.




  more secondary coils = higher secondary voltage
Types of Transformers

•A step-down transformer will decrease the voltage in the
 secondary circuit.




    fewer secondary coils = lower secondary voltage
 •Voltages in the primary and secondary circuits can be
  found as follows:

                       •where,       N1 = # of primary coils
   N1 V1
                                    N2 = # of secondary coils
   N 2 V2                            V1 = primary voltage
                                     V2 = secondary voltage


Example #1
A 50 turn primary coil is supplied with 120 V. What will
the voltage be in the secondary circuit if there are 15 turns in
the secondary coil?
•Current can also be determined.


  V1 I1  V2 I 2
 Example #2
 A voltage of 120 V is supplied in primary circuit of a
 transformer. If 6.0 V, and 15 A are measured in the
 secondary circuit, what is the primary current?
      Homework
Transformers worksheet
     pg. 522 #1 ab
     pg. 528 #1-4

				
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