Basic Electricity - Senior Secondary 2 - AC motor

AC motor

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TERM: 1ST TERM

WEEK NINE

Class: Senior Secondary School 2

Age: 16 years

Duration: 40 minutes of 5 periods each

Date:

Subject: BASIC ELECTRICITY

Topic: AC MOTOR

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

I.) Discuss the working principle of AC generators

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures,

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION

TEACHER’S ACTIVITY

STUDENT’S

ACTIVITY

STEP 1

INTRODUCTION

The teacher explains extensively the working principles of AC generators

Students listens attentively to the teacher and participate actively                                                                  

STEP 2

NOTE TAKING

The teacher writes a summarized

note on the board

The students

copy the note in

their books

 

NOTE

AC MOTOR

Working principles of an AC motor

The working principles of an AC motor revolve around electromagnetic induction and the interaction of magnetic fields. Below is how it works:

  1. Creation of Rotating Magnetic Field: When alternating current (AC) flows through the stator windings of the motor, it produces a changing magnetic field. This field alternates in direction according to the frequency of the AC power supply.
  2. Interaction with Rotor: The alternating magnetic field induces an electromotive force (EMF) in the rotor windings, according to Faraday's law of electromagnetic induction. As a result, currents are induced in the rotor conductors, creating their own magnetic field.
  3. Rotational Force Generation: The magnetic fields of the stator and rotor interact, resulting in a force known as the Lorentz force. This force causes the rotor to rotate in the direction determined by the interaction of the magnetic fields.
  4. Continuous Rotation: As the magnetic field of the stator continues to alternate, the direction of the magnetic field interacting with the rotor also changes. This causes the rotor to continue rotating in the same direction, resulting in continuous motion.
  5. Synchronous Speed: The speed of rotation of the AC motor is determined by the frequency of the AC power supply and the number of poles in the motor. This is known as the synchronous speed and can be calculated using the formula: Synchronous speed, Ns = 120F

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EVALUATION: 1. Briefly discuss the working principle of an AC generator

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively