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A sample exam for DC/AC I, unit # 12 is presented to the students. This unit covers transformers.
Value-Added vs. Non-Value-Added Activities
By Terry Bartelt, Terry Fleischman
In this interactive object, learners read a description of value-added and non-value-added activities and then place various work duties into these two categories.
Transistor Fundamentals: Decibel Gain, Power, and Voltage
By Patrick Hoppe
Students read about decibel power gain and decibel voltage gain. Examples are given for each.
DC/AC I: Unit 11 Sample Exam
Learners answer six questions about transformers.
Series-Parallel Circuit Analysis Practice Problems: Circuit 3
In this interactive object, learners solve a series-parallel DC circuit analysis problem. Immediate step-by-step feedback is given.
An Impedance Matching Application
By Terry Bartelt
Learners consider why an impedance matching transformer is needed to connect an antenna to a television.
The Reflected Load in a Transformer
Learners examine how the load resistance connected to the secondary coil of a transformer affects the primary current. A brief quiz completes the activity.
Learners examine the impedance matching capability of a transformer and how to select the proper turns ratio to achieve this function. A brief quiz completes the activity.
Transformer Action Demonstration
Learners view animations and video clips showing how power is transmitted from one energized coil to another.
Students read descriptions of the voltage, current, and turns ratios of the primary and secondary coils for a transformer in this interactive lesson.
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