Lesson Notes By Weeks and Term - Senior Secondary 1

Cooling system

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TERM – 2ND TERM

WEEK NINE

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 5 periods each

Date:

Subject: AUTO MECHANICAL

Topic: COOLING SYSTEM

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

I.) Define cooling system

II.) Identify the needs for the cooling system

III.) State the effects of lack of water in a running engine

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 the meaning of cooling system and state the needs for the cooling system in motor vehicle

Students listens attentively to the teacher                                                                          

STEP 2

EXPLANATION

Teacher explain the effects of lack of water in a running engine.

Students exhibit attentiveness and active engagement

STEP 3

NOTE TAKING

The teacher writes a summarized

note on the board

The students

copy the note in

their books

 

NOTE

COOLING SYSTEM

The cooling system in a vehicle is a mechanism designed to regulate the temperature of the engine by dissipating excess heat generated during operation. It typically consists of a series of components, including a radiator, water pump, thermostat, cooling fan, hoses, and coolant (usually a mixture of water and antifreeze).

Needs for the cooling system

  1. Heat Dissipation: The primary purpose of the cooling system is to dissipate the heat generated by the combustion process within the engine. Without proper cooling, the engine would overheat, leading to potential damage or failure of critical components.
  2. Temperature Regulation: The cooling system helps maintain the engine at an optimal operating temperature, ensuring efficient combustion, optimal fuel consumption, and reduced emissions.
  3. Component Protection: By keeping the engine temperature within a safe range, the cooling system helps prevent damage to components such as the cylinder head, pistons, and valves, which are vulnerable to heat-related stress.

Effects of lack of water in a running engine

  1. Overheating: Without an adequate supply of coolant (water and antifreeze mixture), the engine temperature can rise rapidly, leading to overheating. This can cause engine components to expand beyond their tolerances, resulting in potential damage or failure.
  2. Engine Damage: Overheating can lead to severe damage to engine components, such as warping of the cylinder head, piston seizure, and damage to bearings and seals. In extreme cases, overheating can cause catastrophic engine failure.
  3. Reduced Performance: An overheated engine may experience reduced power output, decreased fuel efficiency, and poor overall performance. This can affect the vehicle's drivability and may lead to unsafe operating conditions.
  4. Increased Emissions: A lack of coolant can cause the engine to run hotter than normal, leading to increased emissions of harmful pollutants such as nitrogen oxides (NOx) and hydrocarbons (HC).

EVALUATION: 1. Define cooling system

  1. Identify 4 needs for the cooling system in motor vehicle
  2. State 4 effects of lack of water in a running engine

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively