Learners examine graphs and read that the heat of fusion is the heat energy absorbed by one mole of solid as it is converted to liquid, while the heat of vaporization is the heat energy absorbed by one mole of liquid as it is converted to gas.

In this animated activity, learners explore three major methods of heat transfer and practice identifying each.

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

The effect of connecting voltage sources in parallel to increase amperage to a load is presented.

Learners view wire feed power sources ranging from 110-volt, single phase units to 460-volt, three-phase units. A description and photos of each are provided.

Learners answer questions about the heat treatment of metals using a game show format. Immediate feedback is provided.

In this learning activity you'll apply information about three different sources of governmental power: Unitary, Confederate, and Federal to world governments.

In this exercise, students read a list of sources used in a research report. They follow MLA guidelines to write parenthetical references and to compile a Works Cited page.

Learners examine the types and sources of credit that are available for operators of a farm or other agricultural business.

Students view information taken from various sources and decide if the material is acceptable for a technical research report. After choosing whether or not the source material is acceptable, the students read an explanation from the instructor.

By the end of this module, you’ll be able to:

- List four categories of disease agent sources

- Discover conditions when disease transmission is likely to occur

- Describe the means of disease transmission in a given situation

In this interactive learning object, the learner practices sizing a tank-type water heater for one- and two-family residences, townhouses, and apartments with individual water heaters.

Students read about the concept of true power and view examples of how it is dissipated as heat is provided.

In this animated and interactive object, learners examine a heat exchanger as an example of an automated closed-loop system.

In this learning activity you'll review the six different ways in which electricity is produced: chemical, friction, heat, light, magnetism, and pressure.

Learners examine how vapor pressure is calculated. The vapor pressure of a liquid increases with increasing temperature. If the heat of vaporization and the vapor pressure at one temperature are known, the vapor pressure at a second temperature can be calculated.

In this interactive object, learners calculate the amount of heat evolved or absorbed in chemical reactions. Four practice problems are provided.

Learners study the effect that pressure has on boiling temperatures. Once a liquid has reached a full boil, additional heat does not raise the liquid’s temperature; however, pressure can vary the boiling point of a liquid. A brief quiz completes the activity.

Learners read a description of the wiring configuration of a residential Edison Wire System, which consists of a transformer secondary circuit. The circuit supplies two 115-volt sources and one 230-volt source.

Explore welding electricity fundamentals including electron theory, parts of a circuit, welding power sources, and types of current.