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Explain n-type and p-type semiconductors.
n - Type semiconductor: If small amount of pentavalent impurity (group V elements) is added to a pure semiconductor giving a large number of free electrons in this, the extrinsic semiconductor hence formed is called n- type semiconductor. This addition of pentavalent impurities as like arsenic and antimony offer a large number of free electrons in the semiconductor crystal. These type impurities, which create n- type semiconductors, are called donor impurities as each atom of them donates one free electron to conduction band in the semiconductor crystal.
p - Type semiconductor: If small amount of trivalent impurity group III elements is added to a pure semiconductor giving a huge number of holes in this, the extrinsic semiconductor thus formed is called p- type semiconductor. This addition of trivalent impurities as like gallium and indium give a large number of holes in the semiconductor crystal. These type impurities, that produce p- type semiconductors, are called acceptor impurities as each atom of them creates one hole, into valence band, that can accept one electron.
Explain Overhead Lines and Transformers? Overhead lines absorb reactive power when fully loaded. A line with a current I A, a line reactance of X L ?/phase absorbs I 2 X L V
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