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Authoritative PPT Summary
"Conjectures about Motor Rotation" Electric Motors and Generators PPT Courseware 2
review:
1. Do you know what the following experiment is about?
2. Do you know what the following experiment is about?
3. What should be done to make the electromagnet have the strongest magnetism?
Devices equipped with electric motors in daily life
(a) Electric toys
(b) Washing machine
(c) Electric bicycle
(d) Electric fan
1. Understanding electric motors
An electric motor is what people usually refer to as a motor today.
1. Let the motor rotate
Combined with the textbook pictures 16-2 a and b, complete the experiment according to the experimental requirements and answer:
1. After the circuit is connected during the experiment, does the motor rotate after the switch is closed?
2. If the motor does not rotate, what is the reason for the non-rotation?
3. Why does the motor rotate?
4. Discuss with the students in the neighboring group whether the rotation directions of the motors are the same? If not, what is the reason?
2. What parts does the electric motor consist of?
2. Conjecture about why the motor rotates
Review: The discovery of Oersted's experiment - there is a magnetic field around the current, and it acts on the magnet through the magnetic field, that is, the current has a powerful effect on the magnet.
Let us think about it in the opposite direction. Does the magnet have any powerless effect on the current?
Fill in the boxes in the textbook with your guesses
The rotation of the motor may be related to _____ and _____. A magnetic field may exert _____ on a current-carrying coil, causing the coil to rotate.
extracurricular activities
Homemade small electric motor
(1) Coil production
(2) Production of bracket
(3) Let the coil rotate
1. Which of the following household appliances does not have an electric motor: ( )
A. Washing machine B. Electric fan
C. Rice cooker D. Refrigerator
2. After the motor model is installed correctly, the power is turned on and the motor does not rotate when there is current in the coil. The impossible reason for this phenomenon is ()
A. The friction force is too great
B. The positive and negative poles of the power supply are connected reversely.
C. The power supply voltage is too low
D. The magnet is too weak
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"Conjectures about the rotation of electric motors" PPT courseware on electric motors and generators:
"Conjectures about the rotation of electric motors" PPT courseware on electric motors and generators Review: 1. Do you know what the following experiments are about? 2. Do you know what the following experiment is about? 3. What should be done to make the electromagnet have the strongest magnetism? study..