Page 4 - sheet 2nd term prim 4_Classical
P. 4

Delta Modern Language School
Grade 4
Date ......./......./………

       • Energy chain shows the path of energy from the sun to the different
          devices.

• The energy chain of the hair dryer: -

Sun  Gives us       Light  Converts to    Chemical    Stored in the       Thermal
                   energy                  energy     wood of trees    energy from
                                                                       burning the

                                                                             coal

          Hair dryer  Converts to         electrical  In the electric        +
                                           energy     power station
     Thermal and                                                       kinetic energy
         sound                                          Converts to
         energy

• Law of conservation of energy: energy is neither created nor

     destroyed but it can be changed from one form to another.

• The energy flow in the cell phone.

Electrical energy  Stored in the Battery  cell phone                   Light energy
                                                                       sound energy
                       in the form of                                  Thermal energy
                     chemical energy

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