Electric engine and
direct current electrical generator
Learning objectives that are achieved at
this lesson(Subject Programme reference)
to investigate the acting model of an electric
engine and to explain the received results in a well-argued manner using
Faraday's law of induction and Lentz's law.
Students will describe the current model of the
electric motor and explain the results using Faraday's law and Lenz's rule.
describes the device model of the motor;
arguments to explain the obtained results;
uses Faraday's law and Lenz's rule.
Vocabulary and terminology of the lesson:
DC motor (DPT) — DC electric machine that converts
DC electrical energy into mechanical energy.
The principle of operation of the DC motor can be
given two descriptions:
1. movable frame (two rods with closed ends) with
current in the magnetic field of the stator
2. interaction of magnetic fields of the stator and
A DC generator is an electrical machine that
converts mechanical energy into DC electrical energy.
Faraday experimentally found that when the magnetic
flux in the conducting circuit EMF induction occurs Eind, equal to the rate
of change of the magnetic flux through the surface, limited circuit, taken
with a minus sign.
Experience shows that the induction current excited
in a closed circuit when the magnetic flux changes is always directed so that
the magnetic field created by it prevents the change in the magnetic flux
causing the induction current. This statement, formulated in 1833, is called
the Lenz rule.
at the lesson
Throughout the lesson to instill openness,
cooperation, respect, respect for school property, tolerance in relations
interdisciplinary integration with mathematics
(solution of problems and derivation of the formulas)
Interactive whiteboard, Internet resources
A course of 8 classes. Transformers. Generators
Course of the lesson
of the lesson
activities at the lesson
(W) Express survey
1. The formula for induced EMF magnetic field.
2. In which case, the EMF induction will be maximum?
3. In which case, the EMF induction is zero?
4. The cause of EMF induction in a moving conductor
5.What is solenoid?
6.How are the lines of force directed inside and
outside the solenoid?
7.The formula of the magnetic induction coil? What
does it depend on?
8. What is called alternating current?
9. What is called direct current?
(W) New information:
Today we will get acquainted with the DC motors, we
learn what an important role is played by the electric motors in the home, in
Electric motors have taken such a strong place in
our lives that now it is impossible to do without them: punch, grinder,
View video: Galileo.
• Faraday's experience confirmed the fundamental
possibility of building an electric motor.
• In 1834, B. S. Jacobi created the world's first DC
electric motor, which implemented the principle of direct rotation of the
movable part of the engine. In 1838, this engine (0.5 kW) was tested on the
Neva river to propel a boat with passengers, i.e. received the first
principle of operation of the DC generator
DC machine can operate both in generator mode and in motor mode
play a huge role in our modern life, if the electric motor had no light
(application as a generator), there would be no water at home, since the
electric motor is used in the pump, people could not lift heavy loads (use in
a variety of cranes) …..
Multiple-choice tasks «Device
Distributing material 1
Distributing material 2
has been learned
is necessary to work on
– how do you plan to give more support? How do you plan to challenge the more
Assessment – how
are you planning to check students’ learning?
Differentiation can be by task, by
outcome, by individual support, by selection of teaching materials and
resources taking into account individual abilities of learners (Theory of
Multiple Intelligences by Gardner).
Differentiation can be used at any stage
of the lesson keeping time management in mind.
Use this section to record the methods
you will use to assess what students have learned during the lesson.
Breaks and physical activities used.
Points from Safety rules used at this
the lesson objectives/learning objectives realistic? Did all learners achieve
my planned differentiation work well?
I stick to timings?
changes did I make from my plan and why?
Use the space below to reflect on your lesson.
Answer the most relevant questions from the box on the left about your
What two things
went really well (consider both teaching and learning)?
What two things
would have improved the lesson (consider both teaching and learning)?
What have I learned from this lesson about the class
orachievements/difficulties of individuals that will inform my next lesson?
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Lesson plan Long-term plan unit:
Previous learning A course of 8 classes
W) Express survey 1. The formula for induced
Were the lesson objectives/learning objectives realistic?