Question

What is the basic principle of an oscillator?

Answer 1

Hint: Iron loss on voltage and copper loss of a transformer depends on current. Hence, total transformer heat loss depends on volt-ampere (VA) and independent of phase angle among voltage and current i.e., it is independent of power factor. That is why the rating of the transformer is in kVA and not in kW.

Complete step-by-step solution:
An oscillator is an electronic device that operates on oscillation principles: a periodic fluctuation between two things based on energy changes. Computers, radios, clocks, watches, and metal detectors are among the many devices that utilize oscillators.
A clock pendulum is a simplistic type of mechanical oscillator. The perfect timepiece in the world, the atomic clock, manages time according to the oscillation within particles. Electronic oscillators produce signals in computers, wireless receivers and transmitters, and audio-frequency devices, especially music synthesizers. Many electronic oscillators work according to the same fundamental principle: an oscillator always employs a sensitive amplifier whose output is supplied back to the input in phase. Thus, the signal reforms and sustains itself. This is associated with positive feedback. It is the exact process that sometimes creates unwanted "howling" in public-address systems.
Oscillators convert unidirectional current drawn from a DC source into a wanted frequency of the alternating waveform.
The use of positive feedback helps produce oscillators. The condition for positive feedback is that a portion of the output is combined in phase with the input. An oscillator is a circuit that makes a continuous, repeated, alternating waveform without the input.
The oscillators are the amplifier circuits given with positive or regenerative feedback wherein a portion of the output signal is supplied back to the data. The utilization of positive feedback helps generate oscillators. The situation for positive feedback is that a part of the output is joined in phase with the input.

Note:The oscillator is a generalized word for an active circuit that generates a periodic waveform. The inverter is a technical term for a system that contains an oscillator and provides large amounts of power from a source.