# Yahoo奇摩 網頁搜尋

1. ### A physics question about electrical power

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

2. ### 日光燈每秒閃爍50下定還是100下?

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. ### AL Pastpaper(E&M)

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

4. ### 用手觸摸Halogen燈胆，真的會縮短它的壽命？

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. ### 光強度的問題 (µW / cm2)

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. ### 慳電膽原理

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. ### PHY 問題！！！！

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. ### Physics voltmeter question

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. ### luminous flux / luminous intensity / illuminance?

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

10. ### alternative current

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

1. ### 相關詞

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