An electrician is wiring new electrical outlets in a house and has stored a 49.5-m length of copper wire outside where the temperature is −10.3°C.
When the wire is brought inside and warmed to 21.0°C, by what amount in centimeters will the wire's length increase due to the temperature change?

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Ответ:

kana13

22.02.2020

Physics

$I_{avg}=0.3135A$

Explanation:

Given data

Voltage V=3.70V

time t=7.20h=25920s

Energy E=3.00×10⁴J

To find

Average current I

Solution

As we know that power is:

$Power=\frac{Energy}{y\time} \\Power=\frac{3.00*10^{4}J }{25920s}\\ Power=1.16W\\Also\\Power=V_{voltage}*I_{avg}\\ 1.16W=3.70V*I_{avg}\\I_{avg}=1.16/3.70\\I_{avg}=0.3135A$

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An electrician is wiring new electrical outlets in a house and has stored a 49.5-m length of copper wire outside where the temperature is −10.3°C. When the wire is brought inside and warmed to 21.0°C, by what amount in centimeters will the wire's length increase due to the temperature change?