# Lesson Notes By Weeks and Term - Senior Secondary 1

Measurement

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