samar div lp elec carlo.docx
- 1. Republic of the Philippines DEPARTMENT OF EDUCATION REGION VIII SAMAR SHOOLS DIVISION OFFICE I Objetives: a. Identify resistor color coding. b. Understand the use of resistor color coding table. c. Calculate the value of resistor using resistor color coding table. II. Subject Matter: Topic: resistor color coding TLE_IAE57/8MC-0c-1 References: Consumer Electronics(LM) grade 7& 8 pp26-29 Materials: Visual aid, ¼ watt resitors ;;; III. Procedures TEACHERS ACTIVITY STUDENTS ACTIVITY A. Preliminary Activities Opening Prayer Let us have an ecumenical prayer first. Greetings Good afternoon, class! Collection of assignment Please pass your assignment to the front then from the front to the center. 1. Review Class, let’s have a short recall on our previous topic. What have we discussed last meeting? Very good, anybody from the class who will share about what you have learned from our last topic? Yes! Mr__________ I’m glad that you still remember our previous lesson Prayer Good afternoon sir Mabubay (Submission of Assignment) Sir we discussed about resistors Answer may vary
- 2. 2. Motivation Direction: Study the traffic light on the board and identify its color based on the traffic lights color code. 3. Presentation of the lesson Our topic for today has something to do with the traffic lights color code At the end of the lesson you are expected to: 1. Identify resistor color coding 2. Understand the use of resistor color coding table 3. Calculate the value of resistor using resistor color coding table. A. Developmental Activity 1. Activity Before we discuss our topic I will divide the class into four groups and each group will be given 4 pieces of ¼ watt resistors . Direction. Write the color of each resistor on a piece of paper and identify what color would be the first bond or comes first up to fourth bond. 1. RED- STOP 2. GREEN-GO 3. YELLOW-SLOW DOWN
- 3. 2. Discussion what are the three most characteristics of a resistors? How the Resistance of the Resistors Measured? How do we know which color corresponds to which number? What is resistor color code? 4- Band Resistors 1. Tolerance will have 4-bands 2. Convert nominal value to 3. 1st digit (from left to right) of nominal value = 1st color band 4. 2nd digit of nominal value = 2nd band 5. Number of zeros remaining = 3rd (multiplier) band 6. Tolerance = 4th band 5-Band Resistors 1. Tolerance will have 5-bands 1. Resistance Nominal Value 2. Tolerance 3. Power Rating Trough it’s color bands By using the Resistor Color Code. Resistor color code uses color bonds to easily identify a resistors resistive value and its percentage tolerance.
- 4. 2. Convert nominal value to 3. 1st digit (from left to right) of nominal value = 1st color band 4. 2nd digit of nominal value = 2nd band 5. 3rd digit of nominal value = 3rd band 6. Number of zeros remaining = 4th (multiplier) band 7. Tolerance = 5th band Tolerance Bands To calculate tolerance range 1. Determine the resistors stated resistance 2. Multiply the stated resistance times (x) the tolerance percentage. 3. Add and Subtract your tolerance figure from the stated resistance to identify the acceptable range. 3. Analysis 2,200 Ω x .05 (or 5%) = +/- 110 Ohms tolerance Maximum 2,200 Ω + 110 Ω = 2310 Ω Minimum 2,200 Ω – 110 Ω = 2090 Ω
- 5. RED BLUE YELLO W GOLD 4. Abstraction Class, what have you learned about our topic this day? Okay very good, in your opinion what is the essence of knowing on how to read the resistors color code? 5. Application The teacher will group the student into three. The teacher will provide the colored resistors. Each group will get five colored resistor. They will calculate the resistance and get the maximum and minimum tolerance of the colored resistors. They will write their answer with solution to one whole sheet of paper. IV.ASSESSSMENT 1. 1000 ohm x 0.2 =+/- 20% tolerance Maximum 1000+ 20=1020 ohms Minimum 1000-20=980 ohms Students answers may vary.
- 6. BROW N BLAC K RED GOLD RED BROW N BROW N GOLD Calculate the Stated Resistance for the Resistor 1. What is the stated Resistance and tolerance percentage? Ω (2 pts.) 2. What is the Tolerance of the resistor? Ω (3 pts.) B. 1. What is the stated Resistance and tolerance percentage? Ω (2 pts.) What is the Tolerance of the resistor? 2. What is the tolerance of the resistor? C. 1. What is the stated Resistance and tolerance percentage? Ω (2 pts.) What is the Tolerance of the resistor? 2. What is the tolerance of the resistor? Agreement 1. Bring pcb or printed circuit board and 10 ¼ resistors for tomorrows activity.