Learners apply lever ratios to calculate the mechanical advantage in basic mechanisms.

Students read an explanation of the use of weight-volume relationships and practice calculating density.

Students view a sample of the keystrokes used on a TI-36X calculator to solve for the instantaneous current of a de-energizing circuit.

The superposition theorem is explained as it relates to dc circuit analysis. Examples are given.

Learners work problems to make conversions between RMS, average, peak, and peak-to-peak AC voltages.

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 object, students observe how ATP energy is used to move substances across the cell membrane from an area of lower concentration to an area of higher concentration and when something too large needs to get in or out of a cell.

Learners follow the steps for reducing all of the elements of a complex circuit to a single current source and a single source resistance to create a simple circuit. Several examples are given for dc circuits. The conversion between Thevenin and Norton is also presented.

Learners follow a methodical approach for the dc analysis of series-parallel circuits.

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