By Terry Bartelt
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In this interactive and animated object, learners examine the flow of electron current into and out of hot and neutral sockets during each alternation of an AC waveform. A brief quiz completes the activity.
In this animated and interactive object, learners identify the valves and chambers of the heart.
In this animated activity, learners examine the operation of hydraulic directional control valves and the internal components that divert the fluid.
Test your knowledge of Respiration Trivia!