MIT has long been in the forefront of online education and open learning. They have now, with Harvard University, launched MITx with a free online course on electronics. See this report.
It looks to be of great value to those living where there are no accessible local equivalents. It is a university level course and hard work will be required! Definitely of interest to those doing Physics at A-level or university.
Obviously the need for heating and air-conditioning exists all over, as residents in Tucson would suffer from heat exhaustion in the summer without air-conditioning while those in Buffalo in the winter would freeze without heating. Cooling and heating devices help regulate the temperature, humidity, and air quality residential homes, commercial locations, and industrial facilities. Many items like food and medicine require refrigeration to keep them from spoiling. Technicians carry our repairs, maintenance, and installations of heating, air-conditioning, and refrigeration systems. As these systems are often called HVACR systems, workers are often referred to as HVAC technicians.
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