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  1. ... Kong is 220V, The resistance of the 60W lamp is P=V^2/R,60=220^2/R,R=806.7ohm ...

  2. Fluorescent lamps (日光燈) flashes at frequency of 50 Hz. Fluorescent lamps ...with high frequency ballast that increases the flashing frequency of the lamps . It is possible to increase the luminous efficacy of the lamp by almost 10...

  3. Since the lamps are operating at the rated values, so thepotential difference...

  4. Halogen lamp 鹵素燈泡簡稱為鹵素泡或者鹵素燈,又稱為鎢鹵燈泡、石英燈泡,是...upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Halogen_ lamp _operating.jpg/250px-Halogen_ lamp _operating.jpg...

  5. UV lamp output refers to the UV power at close proximity to the lamp . You...aware that the inverse square law doesn't not apply here because at close distance, the lamp cannot be regarded as a "point source". Hence, if...

  6. In "compact fluorescent lamp " (慳電膽) electrons flow through the fluorescent lamp and collide with mercury...the phosphor coating on the inside of the glass tube. Compact fluorescent lamps emit light from a mix of phosphors inside the bulb, each emitting one...

  7. a lamp is hung from the ceiling and the wall .it is fixed...between p and q is 120 度 while chord q and r make a right angle. the mass of the lamp is 3kg. fing then tension in cord q . 這問題可以用正類似正弦定律計算...

  8. Q1) voltage across ecah lamp = 30V/3 = 10V Q2) voltage across each lamp = 30V Q3) voltage across lamp 1 = 60V volatage across lamp2,3,4 = 60V/3 = 20V

  9. (i) The luminous flux emitted by the lamp F = 250 w * 70 lm/w = 17500 lm (ii) The luminous intensity of the...

  10. For lamps , the filament is heated up to produce heat, and finally light. The...