15 Define the volt, the watt and the kilowatt-hou
An electric lamp is marked '100 W, 220 V
What do you understand by this? What current
is taken by the lamp when it is connected to
220 V mains supply? What is the resistance o
the lamp?

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Ответ:

chrismeldajbaptiste

03.12.2022

Physics

$L \approx 3.103\times 10^{-10}\,m$

Explanation:

The mass of water is:

$m_{H_{2}O} = (4\,mol)\cdot (18\,\frac{g}{mol} )$

$m_{H_{2}O} = 72\,g$

$V_{H_{2}O} = \frac{72\,g} {1\,\frac{g}{cm^{3}} }$

$V_{H_{2}O}= 72\,cm^{3}$

According to the Avogadro's Number, there are $6.022\times 10^{23}\,\frac{molecules}{mol}$ . The total number of molecules in the water is:

$n = 2.409\times 10^{24}\,molecules$

The volume occupied by a molecule is:

$V_{molecule} = \frac{V_{H_{2}O}}{n}$

$V_{molecule} = \frac{72\times 10^{-6}\,m^{3}}{2.409\times 10^{24}}$

$V_{molecule} = 2.989\times 10^{-29}\,m^{3}$

The length of an edge of such cube is:

$L = \sqrt[3]{V_{molecule}}$

$L \approx 3.103\times 10^{-10}\,m$

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15 Define the volt, the watt and the kilowatt-houAn electric lamp is marked '100 W, 220 VWhat do you understand by this? What currentis taken by the lamp when it is connected to220 V mains supply? What is the resistance othe lamp?