Students read how to lock a cell that is being referenced in a formula so that it does not automatically show an increment when the formula is copied.

Learners view an animated explanation of why an adjustment of the output voltage by an AC drive is required to maintain a constant torque as the frequency is varied.

Learners examine how CEC, base saturation, and soil pH work with each other to define plant nutrient availability.

In this interactive object, learners practice their 3D visualization skills by identifying the correct isometric view of an object. Front, side, and top orthographic views are shown.

Describe the inverting op-amp configuration and calculate the circuit gain.

In this animated object, learners examine the operation of a zener diode in the forward and reverse bias conditions. A quiz completes the activity.

In this animated learning object, students view the operation of an oscilloscope that is used to measure AC voltages. A brief quiz completes the activity.

In this animated object, students view an explanation of how current, voltage, and the charge on a capacitor of a series RC circuit change during five time constants. A short quiz completes the activity.

In this learning activity, you’ll explore the characteristics of common, carbon steel shielded metal arc welding electrodes, which fall under American Welding Society specification A5.1.

In this learning object, you’ll explore what tools should be a part of every welding tool bag.

In this interactive object, learners read the common abbreviations used in engineering drawings and then test their knowledge in three short exercises.

Students look at the power dissipated by a single gate and by an IC. The concept of average current draw is introduced and examples are provided.

In this learning activity you'll practice using the 4-input truth table.

Students read how to use the IMCONJUGATE() function to convert complex numbers to their conjugate in rectangular form.

In this learning activity you'll describe customer requirements and specifications as they relate to "Quality" in an organization.

In this learning activity you'll explore the effect of connecting voltage sources in series to increase voltage applied to a load.

In this learning activity you'll understand what flow charts are and how they're used to create computer programs.

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

In this interactive object, students complete progressively more difficult exercises as a way to improve their ability to recognize resistor color code values.

This learning object introduces the student to the calculations involved in a sieve analysis -- including percentage retained and percentage passed.

In this animated and interactive object, learners follow steps that begin with choosing the correct drive roll and include feeding the electrode wire from the spool to the welding gun.

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

Learners view a vector diagram for a series RL circuit. Information on the voltage across each component, the total voltage, and the phase angle is included.

In this interactive object, students read how to calculate the blank size for cylinders in a three-roll pinch roller. A calculator is required for the brief quiz that completes the activity.

This lesson gives the student an overview of grinding wheels and pedestal grinder procedures.