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a light bulb rated 6V, 24W...6V和24W代表什么?
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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? |
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发表于 11-4-2010 09:20 PM
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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. |
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发表于 11-4-2010 09:21 PM
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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. |
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发表于 12-4-2010 02:08 PM
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发表于 22-4-2010 05:02 PM
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楼主 |
发表于 25-4-2010 12:32 PM
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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? |
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发表于 22-5-2010 06:21 PM
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楼主 |
发表于 28-5-2010 09:23 PM
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发表于 31-5-2010 05:13 PM
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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 |
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发表于 12-11-2018 01:48 AM
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6V是input voltage,24W是output power |
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