Common automotive measuring tasks that the learners are likely to encounter- description, context, importance etc. Describe and explain various workshop scenarios involving measurement tasks. Emphasise the importance of care and accuracy in measuring; note the results of careless measuring. PowerPoint slide 2-3 Measuring instruments covered in the workbook Display or exhibit the range of measuring instruments to be used by the learners as they work through this workbook. PowerPoint slide 4 Learner workbook pp. 5-7 Safety Safety precautions Reinforce aspects of personal and equipment safety relevant to measuring. Remind learners of the need to protect themselves when lifting objects; demonstrate if necessary PowerPoint slide 5 Learner workbook pp. 8-9 Feeler Gauges & Straight Edge Feeler gauges and straight edge- description, function / application, care and use. Workshop, hands-on activity Describe purpose and construction of feeler gauges and the straight edge. Demonstrate typical applications of these instruments e.g. spark plug gaps, valve clearances, head or manifold distortion checks. Have learners inspect instruments. Provide group or individual activity for learners to practise using feeler gauges and straight edge- e.g. plug gaps, cylinder head distortion. PowerPoint slide 6, 7, 8, 9 Learner workbook pp. 10-13 Suitable components Activity 1 Learner to complete Activity 1 in workbook. Learners answer questions 1-8 Assess level of knowledge through inspection of answers / oral questioning / class discussion. Learner workbook p. 15 Callipers and Rules Callipers and Rules- description, function / application, accuracy, care and use. Display Callipers and rule/s. Use PowerPoint slides to point out details of each. Demonstrate adjustment of calliper, calliper “feel”, and transferring setting to the rule. Have learners inspect instruments. PowerPoint slides 10 & 11 Learner workbook pp. 17-19 Suitable components
Sliding-Jaw Callipers Activity 2,3 and 4 Extension of concept of measuring with Callipers- types (dial, digital, vernier), resolution and accuracy, and care of instruments. Versatility and applications Show 12 and display different sliding jaw Callipers. Emphasise the improved accuracy of these types, and the need for greater care in using them. Discuss care requirements, and demonstrate their versatility, measuring internal / external lengths, diameters, heights and depths. PowerPoint slides 12 & 13 Learner workbook pp. 20 Dial type Callipers Digital Callipers Demonstrate adjusting a sliding-jaw calliper for correct “feel”. Show how a dial-type calliper is read, and demonstrate how to zero a digital calliper or switch from metric to imperial. PowerPoint slides 14 & 15 Learner workbook pp. 21-23 Vernier Calliper - of the calliper, resolution / accuracy Measuring using the vernier Reading the vernier measurements Care of Callipers Workshop, activity measuring components and recording results Review vernier Callipers Explain the main of a vernier calliper using slide No. 16 or illustration in booklet. Point out the resolution of the instrument and the limits of its accuracy. Use slide No.18 to illustrate a typical measurement. Explain how to interpret the main and vernier scales in order to arrive at the final measurement. Individual student activity - complete Activities 2, 3 and 4. Monitor student progress. Assess level of knowledge through inspection of answers / oral questioning / class discussion. PowerPoint slide 16 Learner workbook pp. 24-28 PowerPoint slides 17 & 18 Suitable components Learner workbook pp. 30-40 Micrometers Types of micrometers, application, parts, reading micrometers. Describe the function, types and typical applications for micrometers. PowerPoint slides 19 & 21
ELECTRICAL MEASUREMENTS Introduction Electricity in the motor vehicle. Oral presentation. Discuss the role of electricity in motor vehicles; point out the need for technicians to be able to make basic electrical measurements. PowerPoint 21 Vehicle Electrical components Simple model circuits Meters Electricity Electricity Electric circuits Discuss a simple concept of electricity, and develop the idea of an electric circuit. Establish the essential of a circuit, using examples. PowerPoint slides 22-23 Learner workbook p. 50 Basic circuits Physical circuit components Earth connection List the essential physical parts of a basic circuit- power supply, conductors and electrical load. Define and discuss electrical loads; display examples. Extend discussion to include common automotive circuits and introduce the use of the vehicle frame as part of the circuit. PowerPoint slide 24 Learner workbook pp. 51-52 Circuit control Controlling circuit with switches Show how a circuit can be controlled by using switches. Reinforce the terms ‘open circuit’ and ‘closed circuit’. PowerPoint slide 25 Learner workbook p. 53 Electrical features of a circuit Voltage Current Resistance Develop the concept of voltage as a form of electrical pressure, stored in a battery, capable of pushing current around a circuit to do useful work. Introduce the units of voltage and current, and the notion of ‘conventional current flow’. Point out the existence of electrical resistance in the circuit, and its effect on current flow. Establish the fact that there is a definite relationship between voltage, current, and resistance. PowerPoint slides 26-28 Learner workbook p. 54
Multimeters- types Display switched-range and auto-ranging multimeters. Demonstrate the differences in operating techniques for each type. PowerPoint slides 33-34 Learner workbook pp. 71 Test Equipment Switched range multimeter Have learners examine switched range multimeters (or sketches) complete with test leads, and explain the function of the various controls. PowerPoint slide 35 Learner workbook pp. 72-74 Measuring volts, amps, ohms Measuring with individual meters Use sketches, slides, or real circuits to demonstrate connections required to measure volts, amps and ohms. Reinforce the importance of parallel connection for voltage, series for current, and disconnection of component for resistance checks. PowerPoint slides 36-37 Learner workbook pp. 75-77 Measuring with a multimeter Transfer from single meters to the multimeter, using multimeter face as a reference. Expand the notion of two- or three-digit values for electrical quantities to encompass very large or very small values. Introduce prefixes - micro, milli, kilo, mega at least, with symbols and examples. PowerPoint slide 38 Learner workbook pp. 78-80 Measuring voltage Measuring current Measuring resistance Demonstrate the techniques required for measuring volts, amps and ohms with a multimeter, on actual (simple) circuits. Emphasise the correct use of test leads and test sockets, and the careful selection of function and range. Summarise & reinforce important points relevant to multimeter use. PowerPoint slides 39-42 Learner workbook pp. 81-89 Activity 8 Learners complete Activity8 Learners answer questions 1 - 8 Assess level of knowledge through inspection of answers / oral questioning / class discussion. Learner workbook pp. 91-95
Activity 9, 10 and 11 Learners complete Activities 9, 10 and 11 Workshop, hands-on activity Provide or individual activity for learners to practise using multimeters. Assess level of knowledge through inspection of answers / oral questioning / class discussion. Learner workbook pp. 96-100