On figure 1 below is load distribution on a two wire d.c. distributor fed from one end from a 400V from dc  source. The distributor has a 0.27cm2 cross sectional area of each conductor. Assuming lengths LAB=75m,  LBC=100m and LCD=50m, while a resistivity of 1.78µΩcm for the wires, determine: a. currents along various sections of the distributor b. the two core resistances of each section of the distributor c. the voltage at each tapping point

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Photoelectric

The photoelectric effect occurs when light (or similar incident radiation, including X-rays) falls on material together with a metal plate and causes it to emit electrons. The discovery of the photoelectric effect led to important new theories (and to a Nobel Prize for Albert Einstein). Photoelectric cells, or photocells, are utilized in burglar-alarm light detectors and garage-door openers (each employs a through-beam of light this is broken when something movements throughout it), and also to play soundtracks on film movies (in which a light beam shines through the soundtrack encoded at the film and is "read" with the aid of the photocells).