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What is Origin of life? What's the role of science in life and does science explains origin of life?

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Can science explain the origin of life? A full scientific explanation for the origin of life doesn't currently exist, but research groups round the globe are tackling the mystery. Here we'll take a glance at a couple of of their discoveries. Darwin's theory of biological evolution tells us that each one life on Earth may have originated from one , relatively simple reproducing creature, living within the distant past. this concept is predicated on many observations one among which is that when living things reproduce children are often born with random new trairts. Those with negative new traits are less likely to survive and reproduce, those with positive new traits are more likely to survive and pass those traits on to their children. Over multiple generations positive traits build up allowing relatively simple life forms to evolve into complex life forms and even split into multiple different species. A careful check out the fossil record overwhelmingly confirms Darwin...
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Chap.16 Semiconductor Devices,12th Maharashtra board full notes and explanation

Semiconductor Devices


p-n junction diode as rectifier

An electronic device which converts bidirectional current (AC current) to unidirectional current (DC current) is called a rectifier. The process is called as rectification.
There are two methods of rectification 1. Half wave rectifier. 2. Full wave rectifier.

Generally process is as follows
1. AC supply is connected to the primary coil of transformer.
2. Secondary coil is connected to the diode rectifier for conversion of the current.
3. Then a filter is connected to it , to remove the fluctuations in the current.
4. Last instrument used is a voltage regulator that provides the needed voltage of dc for the load.
5. The diagram below shows the correct representation of the points.



Half wave rectifier

Working of a half wave rectifier
  • Half wave rectifier, rectifies the alternative cycle of a AC current.
  • AC supply is connected to transformer and it is connected to the diode rectifier in series.
  • When high voltage flows through the rectifier it acts as forward biased and current passes.
  • Whereas as when low voltage gets to the diode rectifier it acts as reverse biased and stops the current.
  • Hence only the positive cycle of the sinusoidal AC current is converted to DC current.

Circuit diagram of a half wave rectifier.




Waveform of input and output signals for half waveform rectifier
















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