The subject of Electrical Engineering deals with the utilisation of electrical power to provide us with a richer way of life. Electrical Engineering includes many different topics, from Power Generation and Distribution systems, to Electrical Machines such as motors and transformers, to Electrical Appliances such as electric toasters, refrigerators and freezers, televisions, etc. In general such items are all built using many different kinds of electrical components. (Wires and cables, resistors, capacitors, inductors, lamps, batteries, etc. are examples of just a few different electrical components.) Electronics Engineering is a specialised branch of Electrical Engineering which deals with components such as semiconductor diodes, triodes, transistors, computer and similar microcircuit chips, printed circuit boards, etc. Depending on where they are to be used (the applications), electronic circuits can be built to handle a very wide range of power, ranging from such things as radios, computers, mobile phones, which can require power in a range of a few mW (mW = milliWatts = thousandths of a Watt) to less than 100 Watts, to much more powerful circuits for things such as power control systems for things which can generate or consume many MW. (MW = MegaWatts = thousands of Watts.)