Lesson Notes By Weeks and Term - Senior Secondary 1

Safety device fuse

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Term: 3rd Term

Week: 6

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 5 periods each

Date:       

Subject:      Physics

Topic:-       Safety device fuse

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

  1. Define fuse
  2. List and explain types of fuse
  3. Determine faults in a circuit

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 reviews the previous lesson on solar energy

Students pay attention

STEP 2

EXPLANATION

He defines and explains fuse. He lists and explains the types of fuse

 

 

Students pay attention and participates

STEP 3

DEMONSTRATION

He explains how to detect faults in a circuit

 

Students pay attention and participate

STEP 4

NOTE TAKING

The teacher writes a summarized note on the board

The students copy the note in their books

 

NOTE

FUSE

Fuse is a protective device, designed to melt at the passage of excess electric current through it.

It can also be defined as a device for opening circuit, by means of a conductor designed to melt when an excessive current flows along it.

The conductor actually designed to melt is called fuse element.

Fuse element is the part of the fuse that is designed to melt and then open the cct

CURRENT RATING OF A FUSE

It is the minimum current which the fuse will carry for an indefinite/ unlimited period without deterioration of the fuse element 

FUSING CURRENT

It is the minimum current that will cause the fuse element to heat up and melt/ rapture or blow.

FUSING FACTOR

It is the ratio of the fusing current upon the current rating.

Fusing factor = fusing current/ current rating

 

TYPES OF FUSE

 

FUNCTIONS OF FUSE

  1. Acts as a barrier between the electric circuit and the human body
  2. Prevents device failure due to faulty circuit operation
  3. Fuse prevents short-circuits
  4. Prevents overload and blackouts
  5. Prevents damage that is caused due to mismatched loads

 

DETECTING FAULT IN ELECTRIC CIRCUIT

  1. Merger tester – insulation resistance test
  2. Test bell – polarity test
  3. Earth-loop impudence tester – test for earthling
  4. Continuity tester – test for continuity

 

EVALUATION:   1. Define fuse

  1. List some types of fuse
  2. What are ways one can detect faults in an electric circuit?

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively