- #1

alexandria

- 169

- 2

## Homework Statement

So i have an idea of what I am supposed to do, but i don't know if I am on the right track, Any help would be appreciated! Thanks in advance :)

## Homework Equations

relevant equations are listed below with each question

3. The Attempt at a Solution

d) yearly energy cost

3. The Attempt at a Solution

d) yearly energy cost

ok so to calculate the yearly energy cost i would use the equation Y = Energy x cost

1. Y = (448 kWh/yr) x ($0.06) = $26.9 /year

2. Y = (393 kWh/yr) x ($0.06) = $23.6/year

3. Y = (420 kWh/yr) x ($0.06) = $25.2 /year

4. Y = (362 kWh/yr) x ($0.06) = $21.7 /year

5. Y = (301 kWh/yr) x ($0.06) = $18.1/year

6. Y = (153 kWh/yr) x ($0.06) = $9.18/year

e) energy used in one week

e) energy used in one week

so to calculate the energy each appliance uses in one week, i would use the equation

energy = Power x time

since we are only solving for the energy used in 1 week, the total time is 168 hours

the only problem is how do i calculate the power in watts, do i use the energuide rating (in part b) and convert it into watts, so i can solve for the energy consumption in one week? I am not even sure if my equation is right,

for ex:

1. E = 448 kWh x 168 hours (does 448 kWh have to be converted to Watts)

can someone please verify and explain what to do here?

**f)**

when they say 'estimate' do they mean make a guess for how many hours a week each appliance is used?

**g) power for one week**

ok so i know that Power = Work/time

it can also be Power = Energy/time

so i would take the energy used in one week, for each appliance (calculated in part e), and divide it by the total time which is 168 hours. is this correct?