7- TLE Electrical Maintenance and Inastallation LESSON 2.pptx

Grade 7 TLE

1. EIM

2. LESSON 2 Performing Measuration and Calculation

3. LEARNING OUTCOMES: At the end of this lesson, you are expected to do the following: LO 1. select measuring tools and instruments; and LO 2. carry out measurements and calculations.

4. Definition of Terms: Amperage (Amps) - a unit of measurement of electrical current flow

5. Ampere - a unit of measurement which describes the amount of electric current passing a certain point at a particular time

6. Centimeter - hundredth of a meter Inch - a portion of a foot, which is an English unit of linear measurement

7. Megger - an instrument used to measure the insulation resistance of conductors or wire. It gives measurement in ohms or meg-ohms

8. Millimeter - one-thousandth of a meter Multi-tester - an electrical measuring instrument used to measure the voltage, the resistance or the current of a circuit. It is connected either through parallel or series with the circuit depending on what to measure

9. Ohm - the unit of measurement used to express resistance Ohmmeter - an instrument used to measure resistance in ohms

10. Volt - a unit of measurement of electrical pressure or voltage Voltmeter - an instrument specially designed for measuring voltage

11. Wire Gauge - used to measure the diameter of magnetic wire

12. MEASURING TOOLS AND INSTRUMENTS Measurement is the process or the result of determining the ratio of a physical quantity , such as a length, time, temperature, etc., to a unit of measurement , such as the meter, second or degree Celsius.

13. M etrology - t he science of measurement

14. The English word measurement originates from the Latin mēnsūra and the verb metiri through the Middle French mesure .

15. Different kinds of measuring tools and precision measuring instruments are as follows:

16. System of Measurement

17. A system of measurement is a set of units which can be used to specify anything can be measured.

18. These are common units of measurement used in making layout and installation of electrical materials:

19. A. Linear measures 1. English system provides the creative way on how people can measure by themselves. For example, people measure shorter distance on the ground with their feet. They measure long distances by their palms which is equal to a yard. Inch, Yard and Miles.

20. 2. Metric system is a decimalized system of measurement. It exists in several variations with different choices of base units. Metric units are widely used around the world for personal, commercial and scientific purpose. Millimeter, Centimeter, Decimeter and Meter.

21. B. English units and each equivalent 12 inches = foot(ft) 1 foot = 3yard (yd) 1 yard = 36 inches

22. C. Metric units and each equivalent • 10millimeter (mm) = 1centimeter (cm) • 10centimeter = 1decimeter(dm) • 10 decimeter = 1meter

23. English to metric equivalent • 1 inch = 2.54 cm • 1 foot = 30.48 cm • 1 yard = 91.44 cm

24. E. The centimeter graduation .5mm 1mm 10mm or 1cm 25 mm or 2.5 cm

25. The graduation shows that every digit is .5mm How to read the cm graduation: 1. First graduation is .5 mm 2. Second graduation is 1mm 3. Third graduation is 1.5mm 4. Fourth graduation is 2mm

26. F. The inch graduation 1/16 3/16 5/16 7/16 9/16 11/16 13/16 15/16   0 1/8 1/4 3/8 1/2 5/8 3/4 7/8 1 inch

27. How to read the inch graduation: 1. First graduation is 1/16 2. Second graduation is 1/8 3. Third graduation is 3/16 4. Fourth graduation is 1/4, then follow the given scale above.