Electrical machines are found in many places. This paper describes how a computer, an electronic iron, a mobile phone, and a fridge are structured, and work.
Computer structures include; the basic input output system (BIOS), Central processing unit (CPU), Random Access memory (RAM) - temporary storage, the hard disk (permanent storage), communication channel ( cables/wireless), Bus(high speed internal communication), and other ad-on devices. The BIOS stores all the parameters to be input as turn on or turn off devices, flash disks, USB, printers, keyboard, sound cards etc. these parameters are found in the flash memory. The CPU is the processing part of the computer. It performs all the input instructions. The temporary memory holds information being processed and output. After processing the information is sent to the permanent storage for future access. The BUS connects the internal units. The cables connect input and output devices.
The electronic iron is basically a resistant element that is built into a casting of aluminum. The aluminum casting is called soleplate. An electric current is passes through a heater that is in contact with the soleplate that is used to press on the clothes.
A mobile phone has the following basic structures. A speaker, display units, keyboard, microphone, a circuit board, antennae, and a battery. The antennae receive and send out signals that have been either input or output. The speakers receive voice from the inbuilt processor that change signals into voice, while the microphone inputs sound that is changed in to signals and output through the antennae. The battery provides power. The display provides visual interaction platform for the user.
A fridge has an evaporator, extension devices, condenser, vent fins, compressor and storage. The compressor compresses the gas (HFC) that heats up and passes through the coils. It can lose some of the heat to the surrounding. The gas can change to liquid as it cools. The liquid then flow through the expansion valve where there is low pressure. This leads to the gas boiling and changing into gas (Vaporization). The colder liquid pulls heat from the compartments making the inside of the refrigerator cold.