(物理)大家請幫忙。設計直流電與交流電之實驗。

Description

The production of electricity ismostly in the form of AC (alternating current), however DC (direct current)electricity is also commonly encountered. The design features of electricalequipment are dependant upon tb source of electricity from which it willoperate. In this activity students will compare a DC motor to an AC motor to increase their understanding of thedifferences between the two and therefore the impact this has on society.

In this activity students will:

‧
Construct a working model of a DC electric motor

‧
Identify the main components of a DC electric motor

‧
Compare the components of a DC motor to an AC motor

‧
Compare AC electricity to DC electricity

Activities

1.
Research theinternet for possible designs for a home made model of a DC motor

2.
Produce a plan ofyour model as well as a list of materials needed.

3.
Construct yourworking model motor.

4.
Complete theworksheet Parts of a DC Motor

5.
Produce a tablewhich summarises the advantages and disadvantages of AC electricity and DC
electricity.

Assessment

Students are to provide thefollowing:

1.
The plan of your model with the materials used listed.

2.
A working model thatwill be demonstrated to the class.

3.
Worksheet on Parts ofa DC Motor

4.
Table with theadvantages and disadvantages of AC and DC electricity.

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ngks

I'm not quite experienced in experimental activities......
And I'm not quite sure about the requirements in your school, so I can only provide the following details:
1. design of a home-made DC motor: Please refer to my reply on your another post
2. design of an AC motor: Instead of a pair of permanent magnet, a coil is used instead. When connected to the same source as the motor does, the new coil will produce an alternating magnetic field so that the direction of net torque will remain the same even after the direction of current in the source changes.
...

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