A cable is tested by loss of charge Method using a Ballistic galvanometer with following results : Discharged immediately after electrification deflection 200 divisions. Discharged after 30 second and after electrification (i) Deflection 126 divisions (ii) When in parallel with a resistance of 10 V deflection 100 divisions. Calculate the insulation resistance of the cable.

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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).