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Electric Current Through a Lightbulb

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The Current Through a Lightbulb in a flashlight is 0.750 A.
a) How many electrons entered the filament every second?
b) How many electrons exited the filament every second?
c) Where do the electrons entering the filament come from? Where do they go after exiting?

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Solution Summary

How many electrons entered and exited the filament every second are found. The solution contains calculations and a brief explanation for (a) through (c). The solution is 130 words.

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a) Let's first calculate the total charge entering Filament every second. From the
expression for current, i = qt, we have
q = i*t = (0.75A)(1s) = 0.75 C
Since one electron has an ...

Solution provided by:
Changping Wang, MA
Education
  • BSc , Wuhan Univ. China
  • MA, Shandong Univ.
Recent Feedback
  • "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
  • "excellent work"
  • "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
  • "Thank you"
  • "Thank you very much for your valuable time and assistance!"
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