Lesson Notes By Weeks and Term - Senior Secondary 1

Measurement

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Term: 2nd Term

Week: 2

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes

Date:       

Subject:      Food and nutrition

Topic:-       Measurement

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

  1. State the unit of measurement of the energy value of food
  2. Outline the units of measurement of vitamins

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

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures

INSTRUCTIONAL PROCEDURES

PERIOD 1

PRESENTATION

TEACHER’S ACTIVITY

STUDENT’S ACTIVITY

STEP 1

INTRODUCTION

The teacher reviews the previous lesson on the scientific study of food

Students pay attention

STEP 2

EXPLANATION

She states the unit of measurement of the energy value of food

Students pay attention and participates

STEP 3

DEMONSTRATION

She outlines the units of measurement of vitamins

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

MEASUREMENT

Energy value of food can be measured in calories or joules but a large unit of energy is measured in kilo-calories.

 

It is the most common unit of measuring energy. The international unit of energy is “joule”. Therefore kilocalories is the amount of heat required to rise the temperature of a thousand gram (1000) of water by 1 degrees Celsius.

 

For example one gram (gm.) of carbohydrate will produce four kilocalories of energy. One gram of protein will produce four kilocalories of energy and one gram of fat will produce nine kilocalories of energy.

 

Food weight: the raw or processed food can be measured in grams or kilograms.

1000 grams = 1 kilogram.

The macro nutrients are measured in grams while the vitamin and trace elements are measured in smaller units because they are required in relatively small quantity by the body and are also present in food in a small quantity.

Vitamins and trace elements are measured in milligrams (mg.) and micrograms (g).

1g     =     1000mg (103mg)

1gm         =       1 000, 000 g (106 g)

Or

1mg         =       0.001 or 10-3gm

1  g         =       0.000001gm or 10-6gm

Other units often used in measuring vitamins are the international unit (I.U) and standard unit (S.I).

EVALUATION:    1. State the units of measurement of the energy value of food

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively