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 learning activity you'll explore what a denial of service attack is and learn how a single hacker can take down an entire system.

In this animated object, learners examine how PLC up/down-counters are used to control an automated parking lot gate.

In this interactive object, learners practice using the phrasal verbs "get on," "get over," "get away," "get down to," and "get away with."