SHS2 Applied Technology · Semester 2 Week 19: Electronic Components and Circuits

Lesson notes

Learning Objectives

Indicator: 2.5.2.LI.10 - Convert moving coil instrument into voltmeter and ammeter

By the end of the lesson, learners can:

Explain the principle of operation of a moving coil instrument, including the roles of the coil, magnet, spring, and pointer.
Describe the construction of a moving coil instrument and identify its main parts from a diagram or actual instrument.
Calculate the value of a multiplier resistor needed to convert a moving coil instrument into a voltmeter, given the meter’s internal resistance and full-scale deflection current.
Calculate the value of a shunt resistor needed to convert a moving coil instrument into an ammeter, given the meter’s internal resistance and full-scale deflection current.
Convert a moving coil instrument into a voltmeter and an ammeter in the workshop or through simulation, and verify the readings against a standard multimeter.

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Curriculum details

Strand: Electrical and Electronic Technology (Strand 5)
Sub-strand: Electronic Components and Circuits (5.2)
Content standard: 2.5.2.CS.1 - 2.5.2.CS.1 Demonstrate knowledge and understanding of electronic measuring instrument and how to use them to take measurements 2.5.2.LO.1 Demonstrate knowledge and understanding of electronic components and use them to design and construct electronic circuits.
Indicator: 2.5.2.LI.10 - Convert moving coil instrument into voltmeter and ammeter
Suggested placement: Semester 2, Week 19 (Week 39 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: NaCCA curriculum document, p. 124

Exemplars (from the NaCCA curriculum)

Collaborative Learning: With the use of the internet, engage learners in mixed ability groups to undergo the following activities:
- Explain principle of operation of the moving coil measuring instruments
- Describe the construction of the Moving coil instruments.
- Outline the advantages and disadvantages of the moving coil instrument
Experiential Learning: Engage learners to work in mixed gender groups to use shunts and multipliers to convert a moving coil instrument into
- voltmeter
- Ammeter

Assessment (2.5.2.AS.10). The document marks these depth-of-knowledge levels for this indicator: Level 2 Skills of conceptual understanding; Level 3 Strategic reasoning.

Teaching and Learning Materials:
- Computers installed with multism software
- Resistors, Capacitors, Inductors
- multimeters
- the use of the internet