hroughout the United States,$0.110/kWh is the verage value energy delivered to r

Question

hroughout the United States,$0.110/kWh is the verage value energy delivered to residences by electrical transmission varies from $0.070/kwh to $0.258/kwh t (a) At this average price, calculate the cost of leaving a 140-W porch light on for two weeks white yeu are on vacation? (b) At this average price, cakculate the cost of making a piece of dark toast in 3.00 min with 100o-W toaster? At this average price, cakulate the cost of drying a load of clothes in 40.0 min in a 5 60 × io, w dryer? Need Help? L

Explanation / Answer

power = energy / time

given,

power = 140 W

time = 2 weeks or 336 hour

140 = energy / 336

energy = 47040 Wh or 47.04 kWh

cost = 0.11/kWh

so cost of 47.04kWh = 0.11 * 47.04

a) average price = $5.1744

energy used by toaster = 1000 * (3 / 60)

energy used by toaster = 50 Wh or 0.05 kWh

average price = 0.11 * 0.05

b) average price = $0.0055

energy used by drier = 5.6 * 10^3 * (40 / 60)

energy used by drier = 3733.3333 or 3.7333333 kWh

average price = 3.7333333 * 0.11

c) average price = $0.4106

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