This is two transistors connected together so that the amplified current from the first is amplified further by the second transistor.

DC/AC converters named inverters are employed to convert a dc supply to an ac level of a definite frequency and value.

A CRT is an electronic tube designed to display electrical data. The basic CRT consists of four major components. Electron Gun, Focussing & Accelerating Anodes

This name is a representation for a device having transfer resistors. As we have seen a semiconductor offers less resistance to flow

A switching converter that changes an ac supply to the ac supply with a different voltage, frequency, phase, or shape is called an AC/AC converter or changer.

The operational amplifier is an amplifier which is directly coupled between the output and input, having a very high gain.