Lesson plan
Long-term plan unit: Electrostatics
School:Almaty High School for girls
st
Date: 1 March
Teacher name: Zharylkassyn Uldana
Grade: 10
Number present: 19
absent:1
Work and power of electric current. Joule–Lenz law. Efficiency of source of
Theme of the lesson
current
 To use the formulae of work, power and efficiency of current source
Learning objectives
in problem solving;
that are achieved at
this lesson(Subject
Programme
reference)
Lesson
By the end of this section, students will be able to:
objectives
 explain the concept of work and power of a current;
 calculate the work and power of a current;
 describe the work done by electric current;
 explain the concept of the power and efficiency of an electrical device;
 describe energy transformation in an electrical circuit.
Understanding
Assessment
Understand Joule-Lenz's law as the amount of heat generated in a wire;
criteria
Application
Solve problems involving Joule-Lenz's law;
Language
Subject-specific vocabulary & terminology
Electromotive force (EMF)
objectives
Kirchhoff’s first law
sum of p.d.s across the resistors
sum of the e.m.f.s
loop’ in this circuit
Useful set(s) of phrases for dialogue/writing
The sum of the currents entering any point in a circuit is
equal to the sum of the currents leaving that same point.
The sum of the e.m.f.s around any loop in a circuit is equal
to the sum of the p.d.s around the loop.
 Appreciation for the unique abilities of each learner.
Values
 Respect for other’s opinion while working in a group.
instilled at the
 Lifelong learning that theories learned from our discussion could be applied
lesson
also to practical life.
 Internationalism – the students must recognize that the discovery of
capacitors is made by physicists who came from different countries.
Visual Literacy Instruction – the students must understand, appreciate and
Crosscomprehend what they have seen in the presentation and other video
curricular
materials.
links
*Utilization of IT in teaching and learning process.
Mathematics-knowledge on algebra, fundamentals and higher mathematics
are pre-requisites to this lesson
Presentation, Interactive Board
ICT skills
The concepts of mechanical work and power;
Previous
The concepts of voltage and current; Ohm's Law.
learning
Course of the lesson
Planned
stages of
the lesson
Beginning
7min
Middle
8-17 min
Planned activities at the lesson
Resources
Teacher:
-Introduces the topic of day and spelling out the learning outcome they
will possess after the study.
1. Organizational moment to acquaint students with the
 The theme of the lesson
 The objectives of the lesson
 The criteria of success for the lesson
 The plan of events for the lesson
2.Start. Energy transformations
Presentation
Teacher shows a picture of electrical devices which transform electric
energy into another one.
Matching
(W) Whole class discussion.
Energy transformation in electric circuits.
In an electric circuit, electrical energy is converted into other forms of
energy. Almost always, a greater or smaller part of the energy is
Presentation
converted into heat (internal) energy. In heating devices, this conversion
is welcomed, whereas in other devices, the resultant heat energy is usually
regarded as an unwanted side effect.
Electric energy
 The work done by electric current:
The work done by current flowing through a given element of an
electrical circuit is equal to the product of the voltage across the element
and the charge that has flowed through the circuit.
 How to calculate work:
The work done by electric current in a given element of a circuit is equal
to the product of the voltage across this element, the current flowing
through the element and the time of flow.
18-25 min
(T) Teacher explanation. Joule-Lenz's law
Joule-Lenz's law shows the relationship that exists among:
 The current that flows through a wire.
 The heat generated by the current that flows through a wire.
 The resistance of the wire and …
 The time the current passes through the wire.
Joule’s law formula: Q = I2 × R × t
where:
Q is the amount of heat, in Joules (J)
I is the electric current that flows through the wire, in amperes (A)
Presentation
R is the value of the electrical resistance of the wire, in ohms (R)
t is the amount of time that current passes through the wire, in seconds (s).
Heating effect
Joule’s law can be established as the amount of heat (Q) generated in a
wire with resistance (R), when a current (I) passes through it for a period
of time (t).
This heat is directly proportional to:
 The square of the current.
 The resistance of wire.
 The time the current flows through the wire.
(I) Individual work.
 What are the heating effects caused by electric current?
26-30 min
Worked example
Calculate the amount of energy supplied by a 4.5 V battery when:
(a) a charge of 20 C passes through it
(b) a current of 25 mA flows through is for
3 minutes
Solution:
Energy = potential difference x
Q = 4.5 x 20 = 90 J
(b) Energy = potential difference x Q =
p.d x current x time
Therefore:
Energy = 4.5 x 25x10-3 x 180 = 20.25 J
31-38 min
End
37-40 min
(f) Formative assessment.
Set of calculations for electrical energy
Appendix
At the end of the lesson, learners reflect on their learning:
-
What has been learned
-
What remained unclear
-
What is necessary to work on
Where possible the learners could evaluate their own work as well as the
work of their classmates using certain assess criteria.
Differentiation –
Assessment – how are you planning
Health and safety regulations
how do you plan to
to check students’ learning?
give more
support? How do
you plan to
challenge the more
able learners?
Differentiation can Use this section to record the methods
Health promoting techniques
be by task, by
you will use to assess what students
Breaks and physical activities used.
outcome, by
have learned during the lesson.
Points from Safety rules used at this
individual support,
lesson.
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.
Reflection
Use the space below to reflect on your lesson. Answer the most
Were the lesson
relevant questions from the box on the left about your lesson.
objectives/learning
objectives realistic? Did all
learners achieve the LO?
If not, why?
Did my planned
differentiation work well?
Did I stick to timings?
What changes did I make
from my plan and why?
Summary evaluation
What two things went really well (consider both teaching and learning)?
1:
2:
What two things would have improved the lesson (consider both teaching and learning)?
1:
2:
What have I learned from this lesson about the class orachievements/difficulties of individuals
that will inform my next lesson?