Electronic Components

Learn about electronic components in our online tutorials: resistors, capacitors, inductors, transistors, integrated circuit . . . and even vacuum tubes / thermionic valves.

There are many components that can be used in electronic and radio circuits. For each type there are variants and these may enable them to be used in different ways.

Passive components

Learn about electronics online with our tutorials about passive components: resistors, capacitors, inducators, crystals and many more.


Active devices: transistor, FET, Vacuum tube / valve, thyristor . .

Semiconductor memory



Battery technology

Batteries of all sorts are used in all forms of electrical and electronic equipment. From children's toys to smartphones, laptops and gadgets right up to electric vehicles.