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Authoritative PPT Summary
"Electric Motor" Electromagnetic Phenomenon PPT Courseware
Exploration 1: Does a current-carrying wire experience force in a magnetic field?
Place the straight wire ab on a smooth metal rail in the magnetic field, turn on the power, let the current pass through the wire ab, observe that the wire ab ______ in the magnetic field, explain: ____________.
Exploration 2: What factors are related to the force direction of a current-carrying wire in a magnetic field?
Guess: direction of current, direction of magnetic field
Method: Control variable method
Experimental program:
1. Keep the magnet stationary, reverse the positive and negative poles of the power supply, and observe the movement direction of wire ab (that is, the direction of force).
2. Keep the power supply stationary, reverse the upper and lower magnetic poles of the hoof-shaped magnet, and observe the movement direction of wire ab (that is, the direction of force).
Thinking about how to make the coil rotate continuously?
A and B are brushes, which are in contact with the half ring, so that the power supply and the coil form a closed circuit.
E and F are two copper half rings, connected to both ends of the coil. They are insulated from each other and rotate with the coil.
No matter which side of the coil is on the side close to the S pole of the magnet, the current flows from left to right. This means that the force direction is always the same, and the coil can continue to rotate.
Function: Change the direction of the current in the coil in time so that the force direction is always the same and the coil keeps rotating.
Self-learning
1. The principle of electric motor_______________.
2. The motor converts ____ energy into ____ energy during work
3. Advantages of electric motors: ______________.
4. List the applications of electric motors in daily life
Consolidation exercises
1. The DC motor can continue to rotate mainly because ( )
A. The function of the coil B. The function of the current
C. The role of magnetic field D. The role of commutator
2. As shown in the figure: In the working process of the DC motor, the "commutator" plays a key role. It can automatically change the _______ in the coil when the coil has just rotated through the equilibrium position, thereby realizing the energized coil. Continuous rotation in the magnetic field, the motor converts _______ into _______ when it works.
test
1. The electric motor is made based on the principle of __________. When the motor works, it converts __ energy into __ energy.
2. The direction in which a current-carrying conductor experiences a force in a magnetic field is related to the _____ direction and the ____ direction. If the two are in opposite directions at the same time, the direction of the force will be __. (Fill in “change”, “unchanged” or “not necessarily”)
3. Regarding DC motors, which of the following statements is correct: ( )
The principle of A DC motor is electromagnetic induction
When the B DC motor works normally, it converts mechanical energy into electrical energy.
The commutator of a C DC motor is composed of two copper half rings that are insulated from each other.
The positive and negative poles of the D power supply and the direction of the magnetic field change at the same time, and the rotation direction of the motor will also change at the same time.
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