- #1

fogvajarash

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## Homework Statement

A household appliance consumes 1800W of power from a 120V wall plug. Calculate the power consumed due to a wire of length L = 22.0m and diameter D

_{1}= 1.628mm (with resistivity p = 1.680 x 10

^{-8}Ωm). If a house spends $1400 per year in electricity bills, how much money can be saved per year by rewiring the house with a new wire of diameter D

_{2}= 2.053mm?

## Homework Equations

P = IV

## The Attempt at a Solution

I have found the power dissipated by the wire, which should be P = 25.1W using the formula P = I

^{2}R (for the second wire) and P = 39.9W (for the first wire). However, I do not know how to relate this with the money spent. How should I approach this problem? I'm not sure on how to proceed. Thanks in advance.