24130 version 1

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Demonstrate knowledge of inductance, capacitors and chokes, and alternating current used in automotive applications

Level / 3
Credits / 3

PurposeThis theory-based unit standard is for people in the automotive repair industry. People credited with this unit standard are able to demonstrate knowledge of inductance, and capacitors and chokes for automotive applications; and alternating current (ac) used in automotive applications.

Subfield / Motor Industry
Domain / Automotive Electrical and Electronics
Status / Registered
Status date / 25 January 2008
Date version published / 25 January 2008
Planned review date / 31 December 2012
Entry information / Recommended: Unit 21707, Demonstrate knowledge of automotive electrical principles,or demonstrate equivalent knowledge and skills.
Replacement information / This unit standard, unit standard 24129, unit standard 24131, and unit standard 24132 replaced unit standard 5464.
Accreditation / Evaluation of documentation and visit by NZQA and industry.
Standard setting body (SSB) / NZ Motor Industry Training Organisation (Incorporated)
Accreditation and Moderation Action Plan (AMAP) reference / 0014

This AMAP can be accessed at

Special notes

Information on automotive electrical principles can be found from: training provider, industry, or manufacturer courses; automotive electrical and electronic textbooks (contact a local book retailer, school or polytechnic library or the public library lending service); vehicle workshop manuals; useful websites include but are not limited to: Automotive Books Ltd Capital Books How Stuff Works New Zealand Book Find public libraries Technical Books Whitcoulls

Elements and performance criteria

Element 1

Demonstrate knowledge of inductance for automotive applications.

Performance criteria

1.1Types of magnetic fields are described by showing the lines of flux.

Rangearound a coil, around a magnet, around a conductor.

1.2The principle of inductance is described in accordance with Lenz's Law.

Rangeself-inductance, mutual inductance.

1.3Magnetic properties of materials are identified in accordance with textbook descriptions.

Rangeair, ferrite, hard and soft iron.

1.4Automotive application and uses of magnetic material are described in accordance with textbook descriptions.

Rangehard and soft iron.

Element 2

Demonstrate knowledge of capacitors and chokes for automotive applications.

Performance criteria

2.1Factors that affect capacitance are explained in terms of plate area, distance apart, and dielectric material.

2.2Types of capacitors are identified and their automotive applications defined in accordance with textbook descriptions.

Rangeelectrolytic, plastic.

2.3Capacitor operation is described by plotting charge and discharge of voltage and current.

2.4Types of chokes and their automotive application are described in accordance with manufacturer specifications.

Rangeiron (ferrite) cored, air cored.

Element 3

Demonstrate knowledge of ac used in automotive applications.

Performance criteria

3.1Procedures for calculating the frequency of ac from a given signal on an oscilloscope is described in accordance with textbook descriptions.

Rangesine curve terms.

3.2Ac values relating to automotive applications are explained by reference to an oscilloscope trace of a signal generator and transformer.

Rangepeak values, average value, root mean square (RMS).

3.3Impedance in an ac circuit containing capacitance, inductance, and resistance is explained in terms of the effects on lead and lag of voltage and current.

Please note

Providers must be accredited by NZQA, or an inter-institutional body with delegated authority for quality assurance, before they can report credits from assessment against unit standards or deliver courses of study leading to that assessment.

Industry Training Organisations must be accredited by NZQA before they can register credits from assessment against unit standards.

Accredited providers and Industry Training Organisations assessing against unit standards must engage with the moderation system that applies to those standards.

Accreditation requirements and an outline of the moderation system that applies to this standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The AMAP also includes useful information about special requirements for organisations wishing to develop education and training programmes, such as minimum qualifications for tutors and assessors, and special resource requirements.

Comments on this unit standard

Please contact the NZ Motor Industry Training Organisation (Incorporated) if you wish to suggest changes to the content of this unit standard.

 New Zealand Qualifications Authority 2018