Republic of the Philippines Department of Education Regional Office IX, Zamboanga Peninsula Zest for Progress Zeal of Partnership 9 TLE/TVL Computer Systems Servicing Quarter 3- Module 7 Terminate /Connect Electrical Wiring/ Electronic Circuits Name of Learner: _____________________ Grade & Section: _____________________ Name of School: ______________________ 1 TLE/TVL– Grade 9 Computer System Servicing Alternative Delivery Mode Quarter III – Module 7: Terminate/ Connect electrical wiring/electronic circuits First Edition, 2020 Republic Act 8293, section 176 states that: No copyright shall subsist in any work of the Government of the Philippines. However, prior approval of the government agency or office wherein the work is created shall be necessary for exploitation of such work for profit. Such agency or office may, among other things, impose as a condition the payment of royalties. Borrowed materials (i.e., songs, stories, poems, pictures, photos, brand names, trademarks, etc.) included in this module are owned by their respective copyright holders. Every effort has been exerted to locate and seek permission to use these materials from their respective copyright owners. The publisher and authors do not represent nor claim ownership over them. Published by the Department of Education Secretary: Leonor Magtolis Briones Undersecretary: Diosdado M. San Antonio Development Team of the Module Writer: Hazel P. Bacasmo Reviewer: Evelyn C. Labad EdD, Nilda Y. Galaura EdD Editor: James L. Colaljo MAEM Illustrators: Myrlan R. Realiza Jezel Joy D. Cabrera Layout Artist: Myrlan R. Realiza Jezel Joy D. Cabrera Management Team: SDS: Ma. Liza R. Tabilon EdD, CESO V ASDS: Judith V. Romaguera EdD OIC-ASDS: Ma. Judelyn J. Ramos EdD OIC-ASDS: Armando P. Gumapon EdD CID Chief: Lilia E. AbelloEdD LR : Evelyn C. Labad EdD PSDS: Ma. Theresa M. Imperial EdD Principal: Nilda Y. Galaura EdD Printed in the Philippines by ____________________________________ Department of Education –RegionIX Office Address: ____________________________________________ ____________________________________________ Telefax: ____________________________________________ E-mail Address: ____________________________________________ 2 What I Need to Know This module is a one-lesson module. It covers key concepts ofterminating / connecting electrical wiring/electronic circuits. In this lesson you will learn to: • Identify methods in connecting and terminating wire; • Devise a simple circuit diagram on any electronic circuits; • Appreciate the importance of adhering to safety procedures in using tools when terminating/connecting electrical/electronic circuits. WIRE TERMINATION/CONNECTION Lesson 1 METHODS AND SAFETY PROCEDURES What’s In Activity 1 Directions: Do the activity below. 1. Given the set of scrambled letters, form the word out of the letters below. NLAP 2. Once you have formed the word, write it in your activity notebook. 3. Then below, you will find again another set of scrambled letters. Form again the word out of the letter inside the box. 4. Form the word again and write it in your activity notebook. MTEARIENT 5. Now that you have formed the two words, make a statement that emphasizes the connection of the two words. In writing, you can state how word 1(first word form)is related to word 2 (the second word) form. 3 What’s New Activity 2: In this activity, you are going to make observations on the two pictures below. Write your observation on a sheet of paper. Figure 1 Figure 2 4 What is It PARTS OF A SIMPLE CIRCUIT A simple circuit contains the minimum things needed to have a functioning electrical circuit: 1. Source- adeviceusedtosupplyACorDCvoltage. 2. Consuming- any device that consumes voltage, whatever component or piece of equipment that is connected to as source and draws current from a source is a load on that source. 3. Controlling- any device having two states, ON (closed) and OFF (open). Ideally having zero impedance when closed and infinite impedance when open. 4. Protecting- a component used to open the circuit when current exceeds a predetermined maximumvalue. 5. Connecting- amaterialthatconductselectriccurrentverywellandusedto connectacompletepathforcurrent. Electrical termination of a signal involves providing a terminator at the end of wire or cable to prevent aRadio Frequency (RF) signal from being reflected back from the end, causing interference. The terminator is placed at the end of a transmission line or daisy chain bus (such as in SCSI), designed to match impedance and hence minimize signal reflections. 5 ELECTRICAL CONNECTIONS Whether you are adding new electrical gear or rewiring something already aboard, the requirements for reliable and safe electrical connections are the same. You need the right wire, the right terminal fittings, and a couple of inexpensive hand tools. WIRE TERMINATION/WIRE CONNECTION A wire termination is the work performed to the end of a wire that allows it to connect to a device (connector, switch, terminal, etc.). Wire connection is a task performed to extend the cable or wire in a circuit. CATEGORIES OF WIRE TERMINATION 1. A crimp termination is performed when the device requires a contact or terminal. The wire insulation is stripped, and the contact or terminal is attached to the wire using a crimp tool. The tool crimps the contact or terminal onto the wire conductor. 2. A solder termination is performed when the wire conductors attach directly to the device. This requires stripping off the wire insulation and applying flux and solder to connect the wire to the device. METHODS OF WIRE TERMINATION 1. O-Ring Termination – a popular type of connecting a power source to a lighting fixture. 2. Power Cable Termination- a very common type of connector and is often used within basic appliances and less critical applications. METHODS OF CONNECTING WIRE 1. Soldering - A much better way is to solder the wires together. Twist the strands as before, use something to hold them in place and use a soldering iron. The easiest way is to use a flat tip which you then place under the wires. This will ensure that the wires get hot enough and make a good connection with the solder. Don't push the solder against the iron to melt it but only touch the wires instead. Figure 1 6 2. Tape it together - The first method is quick and easy, but I wouldn't use it for anything but a very short term solution until you can make a better connection. Begin by twisting the wire strands together as tightly as you can. Finish off by applying electrical tape around the twisted part for insulation. The tape will also provide a bit of strength Figure 2 by holding the two wires together. 3. Solder and seal connectors - It's an easy and effective solution, but the connectors are a bit more expensive. This method was actually used during the WW2 to quickly repair broken wires on the field. Figure 3 4. Push in wire connectors - Using push-in wire connectors, you simply push in both wires and you're done. This is probably the best option if you have to connect multiple wires at once, as you can buy connectors with more than two Figure 4 slots. 5. Dupont Connectors- They are used on a lot of electronicequipment, including extensively on Arduino and PC's. They're great for quickly connecting things together. They're also perfect for replacing different parts, as you can swap anything in seconds. You will need to buy both Figure 5 male and female connectors, as well as the plastic cases and a special crimping tool. 7 6. Quick splice connector- The last method is fast and easy and you don't even have to use any tools at all. You simply insert the wires on both ends, without cutting the insulation, and push down the pins. It will cut through the shielding into the wire and create an electrical connection. Figure 6 PROCEDURE IN CIRCUIT DESIGNING 1. Prepare all the tools and materials needed. 2. By using schematic symbol, make a simple circuit with the following: a. load b. consumingdevice c. protectingdevice d. consumingdevice e. connectingdevice 3. Make sure that the circuit has the following requirement that a simple circuit musthave: a. A source of electrical potential difference or voltage. b. A conductive path which would allow for the movement of charges. c. An electrical resistance which is loosely defined as any object that uses electricity to do work. 4. Testthedesignedcircuit. SAFETY PRECAUTIONS WHEN TERMINATING/ CONNECTING WIRES • When wiring, please be sure to turn off the power. Also, while the power is on, please keep the cover closed and do not touch the terminal. • Please apply the correct voltage to the input terminal. If the correct voltage is not applied, regular functions may not run, and this may lead to damage or fire to the product. • Please follow the voltage specifications for terminal polarity, transmission circuits and electrical wiring for I/O jumpers. If errors are made, this may lead to malfunctions. 8 • Please do not remove a connector while the power is on, as this may lead to malfunctions. What’s More ACTIVITY 3: Directions: Identify what method in terminating and connecting wires in column Bmatches with the data in column A. Write only the letter on the space before the number. COLUMN A COLUMN B __________ 1.It is commonly used on electronic a.Tape it together equipment. __________ 2. The wire insulation is stripped, and the b.Push-in wire contact or terminal is attached to the wire using a connectors crimp tool. __________ 3. Finish off by applying electrical tape c.Dupont Connectors around the twisted part for insulation. __________4.Simply push in both wires and you're d.Soldering done. __________ 5. Twist the strands as before, use something to hold them in place and use a soldering e.Crimping iron. 9 What I Have Learned ACTIVITY 4 Directions: Fill in the blank with the corresponding correct word to complete the paragraph.