Electrical and Electronics: Module 14

Module 14A: Single Phase Power Transformers (Core)

Suggested time: 10 - 20 hours

Level: Advanced

Prerequisites: Modules 2, 13

Foundational Objectives

To be knowledgeable and skilled with different materials and devices and their application in the electricity and electronics field.
To test and evaluate the integrity of electrical and electronic components.

Common Essential Learnings Foundational Objectives

To understand and describe transformer operation, turns ratio, voltage ratio and current ratio. (COM)
To make necessary calculations on power usage. (NUM)
To make appropriate decisions regarding the use of transformers. (TL, CCT)

Learning Objectives	Notes
POWER TRANSFORMERS
14.1 To define mutual inductance and transformer ratios. (COM)	Students observe how electromagnetic induction occurs between two coils.
14.2 To identify the high voltage and low voltage leads.	Using an ohmmeter, have students identify different transformer leads. Identify the different markings on a transformer that indicate high and low voltage leads.
14.3 To calculate the voltage, current and turn ratio on the transformer. (NUM)	Using several examples, students should calculate voltage, current and turn ratios.

Module 14B: Single Phase Power Transformers (Core)

Suggested time: 5 - 10 hours

Level: Advanced

Prerequisites: Modules 2, 13, 14A

Learning Objectives	Notes
14.4 To connect a load to a transformer. (NUM)	Calculate efficiency of several electrical circuits using transformers. Use examples to calculate efficiency given the appropriate load, current, resistance and power losses.
14.5 To explain transformer impedance matching. (CCT)	Have students experience the process involved in transformer impedance matching to determine transformer use.
14.6 To identify the different types of transformers and explain their use. (IL)	Students will experiment with different types of transformers and determine how they might be used.
14.7 To troubleshoot transformers. (PSVS)	Check out different transformers to determine if they are working. Observe necessary safety precautions.