The student reviews primary and secondary groups and takes a short quiz.

Learners view the waveforms and voltages of an Edison Three-Wire System and read a description of the polarities across the secondary of the center-tap transformer. This transformer supplies power to residential homes.

Students read descriptions of the voltage, current, and turns ratios of the primary and secondary coils for a transformer in this interactive lesson.

In this animated object, students examine the shades that result from mixing primary and secondary colors. Color tone and level are also defined.

Learners follow a step-by-step explanation of how to test fuses and circuit interrupting devices.

This etool will provide high school educators, specifically career pathway builders, with an overview of implementing programs of study.

Learners are introduced to primary and secondary batteries. Examples are given.

In this learning activity you'll explore the differences between primary and secondary research.

Learners examine how the load resistance connected to the secondary coil of a transformer affects the primary current. A brief quiz completes the activity.

In this animated activity, learners see that changing the resistance value of the load in the secondary of a transformer causes current to vary in the primary.

In this interactive object, learners identify a variety of prevention activities as primary, secondary, or tertiary.

Learners read a description of the wiring configuration of a residential Edison Wire System, which consists of a transformer secondary circuit. The circuit supplies two 115-volt sources and one 230-volt source.