In this course we will begin to study some of the science that supports mechanical refrigeration systems: ranging from the effects of temperature on molecular motion, to the different states of refrigerant within a system. This course covers all the physics necessary to really understand how a system works. An overview of absolute and atmospheric pressure transitions to the Pressure-Temperature relationship of fluid is provided and applied analogously to reading and comprehending pressure gauges.

This IV Curves course covers in depth everything you need to know about the IV curve - the most fundamental technical graph in the PV field. The lessons begin with a simple explanation of all the key values that you can get from the curve, how the curve is affected by typical environmental factors like light intensity or irradiance, temperature and solar spectrum, and various test conditions that take these environmental factors into account. Finally, we cover how to use IV curves to learn about an existing system or design a new one. This is a key fundamental course that can firmly ground your understanding of solar PV technology and allow you to understand system performance, sizing and design much better.

In the Thermostats and Heating Controls lesson you will learn about the different types of thermostats, how they work and their applications, as well as the standard for wiring color codes in thermostats. You will discover the many types of controls used on gas furnaces and burners as you view their operations on a wiring diagram. Finally, you will go through some examples of common, complicated issues encountered in the field and realize they're not so complicated after all.

In this simulation, we'll learn the fundamentals of three-way and four-way switches. We'll cover the mechanics and inner workings of a switch, the code and safety standards that apply, as well as some common configurations that you'll likely encounter. Using interactive simulations which give you feedback at each step of the way, this simulation will give you a chance to put into practice knowledge and concepts you learn about three-way and four-way switches.

In this course, you'll learn how to diagnose and repair 5 of the most common problems that occur with a toilet. Each lesson walks you through in a 3D simulation, with step by step guidance. The faults covered include a damaged wax ring, faulty fill valve, and a broken flapper. Learning is engaging and fun in this toilet troubleshooting course!

This is an assessment simulation, where you'll use the steps and skills you've learned and practiced on the Interplay platform to determine the fault and fix each scenario. Use the bottom tool bar to navigate around the environment, inspect components, access tools, and view diagrams. This is designed to mimic a real-world scenario, so there's no step by step guide giving you instructions for how to troubleshoot the scenario.

Knowledge of basic math skills is essential to all the trades. This course will introduce you to common fractions and how to read them. You'll also learn how to convert fractions, decimals and percent. In addition to that, you will be introduced to pressure, temperature, ratios and proportions.

Learn the mathematical relationship between volts, amps, and ohms using Ohm's Law. Then apply everything you've learned about combination circuits to diagnose what isn't working on a basic circuit in the Interplay Lab.

In this course, you will learn how to troubleshoot a major component of any HVAC system. There are a number of things that can go wrong on a motor. This course covers fuses, overloads, windings, capacitors, starting relays, and fan blades. It also dives into electrical meter ratings, voltage imbalances, and offers some quick temporary fixes for seized motors.

In this course you’re going to learn about the small pipes that transfer water to and from plumbing fixtures. It begins with a couple lessons discussing tailpieces and traps, exploring the many materials, types and applications. These lessons will teach you how to properly configure tubular pipes in addition to some common errors to avoid. After that, you’ll take a look at the supply side to learn about the various supply trim parts, including supply lines and shut off valves. This short course will help you to choose the right trim parts to make sure your fixture works effectively as it's intended to.