Power in Circuits Video Lessons

Concept

# Problem: A typical American family uses 1000 kWh of electricity a month.(a) What is the average current in the 120 V power line to the house?(b) On average, what is the resistance of a household?

###### FREE Expert Solution

(a)

Average current:

$\overline{){\mathbf{i}}{\mathbf{=}}\frac{\mathbf{P}}{\mathbf{V}}}$

Power, P = E/t

Time, t, is one month = 30 days

$\mathbit{t}\mathbf{=}\mathbf{\left(}\mathbf{30}\overline{)\mathbf{d}\mathbf{a}\mathbf{y}\mathbf{s}}\mathbf{\right)}\mathbf{\left(}\frac{\mathbf{24}\overline{)\mathbf{h}}}{\mathbf{1}\overline{)\mathbf{d}\mathbf{a}\mathbf{y}}}\mathbf{\right)}\mathbf{\left(}\frac{\mathbf{3600}\mathbf{s}}{\mathbf{1}\overline{)\mathbf{h}}}\mathbf{\right)}$

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###### Problem Details

A typical American family uses 1000 kWh of electricity a month.

(a) What is the average current in the 120 V power line to the house?

(b) On average, what is the resistance of a household?