Learning Outcome 2

Interpret technical drawing

PERFORMANCE STANDARDS

  • Components, assemblies or objects are recognized as required.

  • Dimensions of the key features of the objects depicted in the drawing are correctly identified.

  • Symbols used in the drawing are identified and interpreted correctly.

  • Drawing are checked and validated against job requirements or equipment in accordance with standard operating procedure.

What Do You Already Know?

Let us determine how much you already know about interpreting technical drawings. Take this test.

What Do You Need To Know?

Read Information Sheet 2.1 very well then find out how much you can remember and how much you learned by doing Self-check 2.1.

Information Sheet 2.1

All electronic circuits from the simplest to the most complex design need diagrams to be used as reference in designing, modifying, and troubleshooting the circuit. The most common used electronic diagrams are schematic, pictorial, wiring, and block diagrams. Each one of these diagrams has its own unique characteristics in presenting the circuit. The different diagrams that you should be familiar with are the following:

Pictorial diagram - It shows the pictures of the actual components and wiring connections although it does not provide the exact size of components. It shows exact shape in proportion to the actual component or device.

Schematic diagram - It shows the components used in their interconnection. Each graphic symbol is also accompanied with a reference designation to distinguish it from other similar symbols. It does not illustrate the physical size, shape or chassis location of the component parts and devices.

1. Series Circuit is a circuit in which lamps are arranged in a chain, so that the current has only one path to take. The current is the same through each load. Example of this is the Christmas lights. It consists of a number of bulbs that are connected side by side to meet the voltage requirement which is 220 volts for alternating current.

2. Parallel Circuit is a circuit in which lamps are connected across the wires. The voltage across each load on parallel circuit is the same. The advantage of using parallel circuit is that even if one of the lamps fails, still the remaining lamps will function.

Block Diagram – This form usually uses block of squares, rectangles or triangles to represent components, group of components or units of equivalent. Block diagrams are particularly used to represent internal components of an integrated circuit.

Wiring diagram – It shows wiring connection in a simplified, easy to follow manner. It may show either internal or external connections or both and is usually drawn as simple as possible to trace out the connection of a circuit. The components of the circuit are identified by name or are represented by means of pictorial illustrations that do not follow any well defined standard form.

How Do You Apply What You Have Learned?

Show that you learned something by doing this activity.

Activity Sheet 2.1 Directions: Draw the schematic diagram of the following using Everycircuit app:

1. Two bulbs connected in series controlled by a single pole switch using direct current.

2. Four bulbs connected in parallel controlled by a single pole switch using alternating current.