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  1. Resistance of the 220 V bulb , Ra = Va^2 / Pa = (220)^2 / 60 = 806.67 ohm Resistance...

  2. ... depends on the power dissipated by the light bulb P. To obtain the maximum brightness, we have to maximize the current through bulb ...

  3. ... invented more than 2,000 electrical appliances. e.g. light bulb Before the light bulb was invented, we had to use...

  4. ...read an article about electric last night. The (a).____invention_____________of light bulbs has greatly improved out lives.Today, we can choose...

  5. ...點解係correct? 呢條個ans 係: D (1) S closed but voltage of bulb P does not change, ie no change brightness of bulb P. (1) ...

  6. ...great help of environmental' issies. It can replace one regular light bulb with a compact fluorescent light. In this way; the carbon dioxide can be save 15...

  7. ... have a gleaming display. Mounted with lights and bulbs as bright as day. It's lovely 'cause though winter lacks color...

  8. ...can help you a lot in composition. "Learning composition" (with a bulb 電燈胆 on its cover). This book written in good English...

  9. Length of mercury thread changes in direct proportion to the liquid temperature. Melting Ice = 0 deg C Steam = 100 deg C Let y be the temperature of the liquid: (y-0)/(100-0)= (12-30)/(180-30) therefore y = -12 deg C or Answer is...

  10. 每個燈泡的電阻=V2 /P =2202 /30 =1613 ohm 當三個燈泡串聯連接至220V電源時, 每個燈泡的電勢差=220 /3 V 總功率消耗=3 x [(220 / 3)2 /1613]=10W