Electronic Components… · SHS2 Applied Technology

Lesson notes

Learning Objectives

Indicator: 2.5.2.LI.11 - Convert moving iron instrument into voltmeter and ammeter

By the end of the lesson, learners can:

Explain the principle of operation of a moving iron measuring instrument, describing how the magnetic field from a current-carrying coil attracts or repels a moving iron vane.
Describe the construction of a moving iron instrument, naming its essential parts: the coil, fixed and moving iron vanes, pointer, scale, spring, and damping mechanism.
State at least three advantages and three disadvantages of moving iron instruments compared with other types of measuring instruments.
Calculate the value of a shunt resistor needed to convert a moving iron instrument into an ammeter with a given full-scale deflection current and desired measurement range.
Calculate the value of a multiplier resistor needed to convert a moving iron instrument into a voltmeter for a given voltage range, and construct both conversions in the laboratory.

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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.11 - Convert moving iron 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. 125

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 iron measuring instruments
- Describe the construction of the Moving iron instruments.
- Outline the advantages and disadvantages of the moving iron instrument
Experiential Learning: Engage learners to work in mixed gender groups to use shunts and multipliers to convert a moving iron instrument into
- voltmeter
- Ammeter
- Ammeter

Assessment (2.5.2.AS.11). 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