...e called upon to handle a significant amount of power. Schottky diodes are a specialised type used particularly in modern [[Power_supplies#Switching_Mod [[File:Img_1912b.jpg|180px|thumb|left|A bridge rectifier.]]

...abbreviated to PSU) to convert the raw electrical power from the mains or a battery to the form needed. In this page we explain the several stages in t ...d with the control and conversion of a relatively large amount of power in a fairly small space, and some of that power will inevitably be wasted as hea

...possible at reasonable cost by the availability of lithium batteries with a high power to weight ratio, and cheap control electronics and sensors. Part The idea of a machine which screws itself into the air dates back to Leonardo da Vinci in

...etism'''. When an electric current flows through a coil of wire it creates a magnetic field. The coil is usually wound around an iron core which then ge [[File:Img_1924a.jpg|180px|thumb|left|A universal motor, dismantled.]]