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

In this interactive object, learners experience how the three primary flight controls allow a pilot to determine the motion of the airplane during flight.

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.

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

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

Learners examine the wiring of the primary components of the three types of DC motors, series, shunt, and compound. The operational characteristics of each type of motor are described. A quiz completes the activity.

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

Studies show that more than 75 percent of all hydraulic system failures are a direct result of unclean oil. In this interactive object, learners examine the three primary types of hydraulic system filters. 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 learning activity you'll explore the differences between primary and secondary research.