| 
| 
查看: 2575|回复: 9
 | 
a light bulb rated 6V, 24W...6V和24W代表什么?
[复制链接] |  
 |  | 
 
| a light bulb rated 6V, 24W...6V和24W代表什么?无论什么时候,那个灯泡的potential difference和power dissipated都是6V和24W吗? | 
 |  |  |  |
 
|  |  |  
|  |  | 
 |  | 
 
 发表于 11-4-2010 09:20 PM
|
显示全部楼层 
| 回复 1# zolo when a potential difference of 6 V is supplied to the light bulb, the bulb will produces energy of 24 J per second.
 | 
 |  |  |  |
 
|  |  |  
|  |  | 
 |  | 
 
 发表于 11-4-2010 09:21 PM
|
显示全部楼层 
| 回复 1# zolo when a potential difference of 6 V is supplied to the light bulb, the bulb will produces energy of 24 J per second.
 | 
 |  |  |  |
 
|  |  |  
|  |  | 
 |  | 
 
 发表于 12-4-2010 02:08 PM
|
显示全部楼层 |  |  |  |
 
|  |  |  
|  |  | 
 |  | 
 
 发表于 22-4-2010 05:02 PM
|
显示全部楼层 |  |  |  |
 
|  |  |  
|  |  | 
 |  | 
 
 
 楼主|
发表于 25-4-2010 12:32 PM
|
显示全部楼层 
| 还有一个关于电的问题。。 A photographic unit consist of a xenon filled tube energised by the discharge capacitor initially charged to a potential difference of 1000V. Average power delivered to the flash tube is 2000W and lasts for 0.02s. Capacitance of capacitor is?
 
 Method1
 Energy stored in capacitor=Pt=1/2 CV^2
 C=2Pt/V^2
 =2(2000)(0.02)/(1000)^2
 =8x10^-5 F
 
 Method2
 current= Q/t=P/V
 Q=2000(0.02)/1000
 =0.04 C
 C=Q/V
 =0.04/1000
 =4x10^-5 F
 
 哪个方法才是正确的?
 | 
 |  |  |  |
 
|  |  |  
|  |  | 
 |  | 
 
 发表于 22-5-2010 06:21 PM
|
显示全部楼层 |  |  |  |
 
|  |  |  
|  |  | 
 |  | 
 
 
 楼主|
发表于 28-5-2010 09:23 PM
|
显示全部楼层 |  |  |  |
 
|  |  |  
|  |  | 
 |  | 
 
 发表于 31-5-2010 05:13 PM
|
显示全部楼层 
| 回复 8# zolo 这边的 t 是指time for the power last in the bulb,而不是time for the power delivered
 | 
 |  |  |  |
 
|  |  |  
|  |  | 
 |  | 
 
 发表于 12-11-2018 01:48 AM
|
显示全部楼层 
| 6V是input voltage,24W是output power | 
 |  |  |  |
 
|  |  |  
|  |  |  |  | 
            本周最热论坛帖子 |